add missing stdlib.h include
add missing stdlib.h include

authmillenon/RIOT,RubikonAlpha/RIOT,Yonezawa-T2/RIOT,LudwigOrtmann/RIOT,fnack/RIOT,LudwigKnuepfer/RIOT,tfar/RIOT,kushalsingh007/RIOT,roberthartung/RIOT,rfswarm/RIOT,d00616/RIOT,basilfx/RIOT,Osblouf/RIOT,alignan/RIOT,jremmert-phytec-iot/RIOT,brettswann/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,d00616/RIOT,haoyangyu/RIOT,binarylemon/RIOT,adjih/RIOT,rousselk/RIOT,msolters/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Lexandro92/RIOT-CoAP,jremmert-phytec-iot/RIOT,BytesGalore/RIOT,beurdouche/RIOT,thomaseichinger/RIOT,mziegert/RIOT,RBartz/RIOT,watr-li/RIOT,LudwigOrtmann/RIOT,binarylemon/RIOT,Yonezawa-T2/RIOT,stevenj/RIOT,bartfaizoltan/RIOT,ximus/RIOT,latsku/RIOT,jhollister/RIOT,OTAkeys/RIOT,MarkXYang/RIOT,Darredevil/RIOT,daniel-k/RIOT,beurdouche/RIOT,ximus/RIOT,ks156/RIOT,LudwigKnuepfer/RIOT,robixnai/RIOT,rajma996/RIOT,yogo1212/RIOT,FrancescoErmini/RIOT,daniel-k/RIOT,marcosalm/RIOT,A-Paul/RIOT,gebart/RIOT,benoit-canet/RIOT,stevenj/RIOT,benoit-canet/RIOT,immesys/RiSyn,abkam07/RIOT,rakendrathapa/RIOT,lazytech-org/RIOT,luciotorre/RIOT,DipSwitch/RIOT,zhuoshuguo/RIOT,binarylemon/RIOT,asanka-code/RIOT,Josar/RIOT,miri64/RIOT,avmelnikoff/RIOT,abkam07/RIOT,BytesGalore/PetersRIOT,smlng/RIOT,khhhh/RIOT,Hyungsin/RIOT-OS,Yonezawa-T2/RIOT,Ell-i/RIOT,neumodisch/RIOT,dkm/RIOT,herrfz/RIOT-old,lazytech-org/RIOT,ximus/RIOT,zhuoshuguo/RIOT,gbarnett/RIOT,rousselk/RIOT,watr-li/RIOT,immesys/RiSyn,abkam07/RIOT,Yonezawa-T2/RIOT,lazytech-org/RIOT,TobiasFredersdorf/RIOT,tdautc19841202/RIOT,roberthartung/RIOT,latsku/RIOT,gautric/RIOT,kb2ma/RIOT,toonst/RIOT,MonsterCode8000/RIOT,yogo1212/RIOT,x3ro/RIOT,neiljay/RIOT,asanka-code/RIOT,herrfz/RIOT,Lexandro92/RIOT-CoAP,jasonatran/RIOT,rousselk/RIOT,binarylemon/RIOT,gebart/RIOT,brettswann/RIOT,FrancescoErmini/RIOT,Darredevil/RIOT,changbiao/RIOT,kushalsingh007/RIOT,brettswann/RIOT,daniel-k/RIOT,basilfx/RIOT,authmillenon/RIOT,emmanuelsearch/RIOT,spium/IoT-RIOT,miri64/RIOT,thomaseichinger/RIOT,kb2ma/RIOT,katezilla/RIOT,centurysys/RIOT,mtausig/RIOT,asanka-code/RIOT,plushvoxel/RIOT,neiljay/RIOT,AnonMall/RIOT,fnack/RIOT,Osblouf/RIOT,alex1818/RIOT,bartfaizoltan/RIOT,RIOT-OS/RIOT,backenklee/RIOT,shady33/RIOT,jbeyerstedt/RIOT-OTA-update,l3nko/RIOT,1blankz7/RIOT,abp719/RIOT,katezilla/RIOT,benoit-canet/RIOT,dhruvvyas90/RIOT,rfswarm/RIOT,abp719/RIOT,A-Paul/RIOT,koenning/RIOT,PSHIVANI/Riot-Code,zhuoshuguo/RIOT,jremmert-phytec-iot/RIOT,RubikonAlpha/RIOT,khhhh/RIOT,Josar/RIOT,mfrey/RIOT,sgso/RIOT,rfuentess/RIOT,lebrush/RIOT,dhruvvyas90/RIOT,aeneby/RIOT,toonst/RIOT,arvindpdmn/RIOT,ros2/ros2_embedded_riot,ks156/RIOT,Darredevil/RIOT,kYc0o/RIOT,dkm/RIOT,l3nko/RIOT,kaspar030/RIOT,LudwigKnuepfer/RIOT,josephnoir/RIOT,jferreir/RIOT,Josar/RIOT,altairpearl/RIOT,josephnoir/RIOT,patkan/RIOT,adrianghc/RIOT,rfswarm2/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,d00616/RIOT,wentaoshang/RIOT,arvindpdmn/RIOT,Lexandro92/RIOT-CoAP,emmanuelsearch/RIOT,jfischer-phytec-iot/RIOT,TobiasFredersdorf/RIOT,gautric/RIOT,brettswann/RIOT,cladmi/RIOT,Hyungsin/RIOT-OS,neiljay/RIOT,Osblouf/RIOT,sgso/RIOT,rakendrathapa/RIOT,jhollister/RIOT,smlng/RIOT,backenklee/RIOT,basilfx/RIOT,ros2/ros2_embedded_riot,neumodisch/RIOT,Darredevil/RIOT,mziegert/RIOT,jremmert-phytec-iot/RIOT,thomaseichinger/RIOT,msolters/RIOT,adrianghc/RIOT,chris-wood/RIOT,gbarnett/RIOT,gebart/RIOT,altairpearl/RIOT,ThanhVic/RIOT,kaleb-himes/RIOT,MonsterCode8000/RIOT,msolters/RIOT,nsol-nmsu/RIOT,TobiasFredersdorf/RIOT,l3nko/RIOT,mziegert/RIOT,x3ro/RIOT,jfischer-phytec-iot/RIOT,A-Paul/RIOT,BytesGalore/PetersRIOT,jferreir/RIOT,openkosmosorg/RIOT,jremmert-phytec-iot/RIOT,ntrtrung/RIOT,MarkXYang/RIOT,alex1818/RIOT,tdautc19841202/RIOT,watr-li/RIOT,haoyangyu/RIOT,MohmadAyman/RIOT,herrfz/RIOT-old,daniel-k/RIOT,kerneltask/RIOT,Lotterleben/RIOT,lebrush/RIOT,BytesGalore/PetersRIOT,alex1818/RIOT,RIOT-OS/RIOT,stevenj/RIOT,herrfz/RIOT,cladmi/RIOT,adjih/RIOT,RBartz/RIOT,fnack/RIOT,LudwigOrtmann/RIOT,ros2/ros2_embedded_riot,patkan/RIOT,BytesGalore/PetersRIOT,basilfx/RIOT,rajma996/RIOT,Darredevil/RIOT,nsol-nmsu/RIOT,dailab/RIOT,l3nko/RIOT,lazytech-org/RIOT,jbeyerstedt/RIOT-OTA-update,EmuxEvans/RIOT,cladmi/RIOT,gautric/RIOT,alignan/RIOT,adrianghc/RIOT,1blankz7/RIOT,Yonezawa-T2/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,herrfz/RIOT,ant9000/RIOT,changbiao/RIOT,BytesGalore/RIOT,luciotorre/RIOT,alex1818/RIOT,dkm/RIOT,lebrush/RIOT,syin2/RIOT,ThanhVic/RIOT,cladmi/RIOT,RubikonAlpha/RIOT,thomaseichinger/RIOT,OTAkeys/RIOT,chris-wood/RIOT,ant9000/RIOT,Lexandro92/RIOT-CoAP,gebart/RIOT,locicontrols/RIOT,automote/RIOT,ks156/RIOT,LudwigOrtmann/RIOT,mziegert/RIOT,DipSwitch/RIOT,TobiasFredersdorf/RIOT,RBartz/RIOT,plushvoxel/RIOT,openkosmosorg/RIOT,aeneby/RIOT,MohmadAyman/RIOT,AnonMall/RIOT,jasonatran/RIOT,mziegert/RIOT,rajma996/RIOT,1blankz7/RIOT,JensErdmann/RIOT,stevenj/RIOT,hamilton-mote/RIOT-OS,kbumsik/RIOT,openkosmosorg/RIOT,phiros/RIOT,kaspar030/RIOT,EmuxEvans/RIOT,MarkXYang/RIOT,Osblouf/RIOT,bartfaizoltan/RIOT,spium/IoT-RIOT,kYc0o/RIOT,avmelnikoff/RIOT,jasonatran/RIOT,ros2/ros2_embedded_riot,EmuxEvans/RIOT,RubikonAlpha/RIOT,koenning/RIOT,chris-wood/RIOT,brettswann/RIOT,Lotterleben/RIOT,AnonMall/RIOT,miri64/RIOT,PSHIVANI/Riot-Code,sgso/RIOT,ros2/ros2_embedded_riot,shady33/RIOT,rfswarm2/RIOT,tfar/RIOT,stevenj/RIOT,altairpearl/RIOT,fnack/RIOT,alignan/RIOT,MohmadAyman/RIOT,automote/RIOT,authmillenon/RIOT,attdona/RIOT,haoyangyu/RIOT,sumanpanchal/RIOT,jasonatran/RIOT,watr-li/RIOT,abp719/RIOT,benoit-canet/RIOT,koenning/RIOT,kb2ma/RIOT,kerneltask/RIOT,MohmadAyman/RIOT,watr-li/RIOT,marcosalm/RIOT,OTAkeys/RIOT,AnonMall/RIOT,locicontrols/RIOT,shady33/RIOT,ks156/RIOT,beurdouche/RIOT,luciotorre/RIOT,fnack/RIOT,ros2/ros2_embedded_riot,avmelnikoff/RIOT,benoit-canet/RIOT,ks156/RIOT,ximus/RIOT,openkosmosorg/RIOT,EmuxEvans/RIOT,Josar/RIOT,abkam07/RIOT,l3nko/RIOT,msolters/RIOT,gbarnett/RIOT,nsol-nmsu/RIOT,neiljay/RIOT,alignan/RIOT,mfrey/RIOT,kbumsik/RIOT,immesys/RiSyn,authmillenon/RIOT,centurysys/RIOT,yogo1212/RIOT,kbumsik/RIOT,rajma996/RIOT,PSHIVANI/Riot-Code,gbarnett/RIOT,MonsterCode8000/RIOT,adrianghc/RIOT,arvindpdmn/RIOT,emmanuelsearch/RIOT,OTAkeys/RIOT,spium/IoT-RIOT,msolters/RIOT,EmuxEvans/RIOT,koenning/RIOT,automote/RIOT,LudwigKnuepfer/RIOT,marcosalm/RIOT,Hyungsin/RIOT-OS,rakendrathapa/RIOT,gbarnett/RIOT,watr-li/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,rousselk/RIOT,patkan/RIOT,Darredevil/RIOT,asanka-code/RIOT,rajma996/RIOT,kbumsik/RIOT,yogo1212/RIOT,rfuentess/RIOT,centurysys/RIOT,sumanpanchal/RIOT,wentaoshang/RIOT,khhhh/RIOT,katezilla/RIOT,PSHIVANI/Riot-Code,kushalsingh007/RIOT,automote/RIOT,haoyangyu/RIOT,katezilla/RIOT,latsku/RIOT,centurysys/RIOT,rajma996/RIOT,rousselk/RIOT,phiros/RIOT,toonst/RIOT,A-Paul/RIOT,Yonezawa-T2/RIOT,syin2/RIOT,kaleb-himes/RIOT,JensErdmann/RIOT,kaleb-himes/RIOT,jferreir/RIOT,alex1818/RIOT,dhruvvyas90/RIOT,MonsterCode8000/RIOT,wentaoshang/RIOT,ThanhVic/RIOT,1blankz7/RIOT,x3ro/RIOT,RBartz/RIOT,robixnai/RIOT,abp719/RIOT,bartfaizoltan/RIOT,luciotorre/RIOT,josephnoir/RIOT,phiros/RIOT,DipSwitch/RIOT,dhruvvyas90/RIOT,OlegHahm/RIOT,sgso/RIOT,MonsterCode8000/RIOT,FrancescoErmini/RIOT,mtausig/RIOT,AnonMall/RIOT,robixnai/RIOT,cladmi/RIOT,d00616/RIOT,shady33/RIOT,FrancescoErmini/RIOT,mfrey/RIOT,BytesGalore/RIOT,benoit-canet/RIOT,chris-wood/RIOT,JensErdmann/RIOT,Lexandro92/RIOT-CoAP,josephnoir/RIOT,MohmadAyman/RIOT,binarylemon/RIOT,zhuoshuguo/RIOT,rfuentess/RIOT,avmelnikoff/RIOT,rfswarm/RIOT,OlegHahm/RIOT,patkan/RIOT,bartfaizoltan/RIOT,kaleb-himes/RIOT,gbarnett/RIOT,rfswarm2/RIOT,biboc/RIOT,robixnai/RIOT,malosek/RIOT,shady33/RIOT,locicontrols/RIOT,sumanpanchal/RIOT,tdautc19841202/RIOT,MonsterCode8000/RIOT,phiros/RIOT,ThanhVic/RIOT,TobiasFredersdorf/RIOT,adrianghc/RIOT,BytesGalore/PetersRIOT,BytesGalore/RIOT,ntrtrung/RIOT,robixnai/RIOT,MohmadAyman/RIOT,alex1818/RIOT,emmanuelsearch/RIOT,miri64/RIOT,luciotorre/RIOT,latsku/RIOT,malosek/RIOT,tdautc19841202/RIOT,kbumsik/RIOT,neumodisch/RIOT,authmillenon/RIOT,nsol-nmsu/RIOT,OTAkeys/RIOT,rakendrathapa/RIOT,roberthartung/RIOT,mtausig/RIOT,hamilton-mote/RIOT-OS,RubikonAlpha/RIOT,wentaoshang/RIOT,DipSwitch/RIOT,arvindpdmn/RIOT,adjih/RIOT,kerneltask/RIOT,biboc/RIOT,Lexandro92/RIOT-CoAP,herrfz/RIOT,d00616/RIOT,kaspar030/RIOT,changbiao/RIOT,lebrush/RIOT,attdona/RIOT,roberthartung/RIOT,ant9000/RIOT,malosek/RIOT,authmillenon/RIOT,backenklee/RIOT,JensErdmann/RIOT,dailab/RIOT,shady33/RIOT,kushalsingh007/RIOT,biboc/RIOT,toonst/RIOT,OlegHahm/RIOT,openkosmosorg/RIOT,rousselk/RIOT,gebart/RIOT,dailab/RIOT,automote/RIOT,thiagohd/RIOT,DipSwitch/RIOT,neumodisch/RIOT,kYc0o/RIOT,neiljay/RIOT,lebrush/RIOT,attdona/RIOT,RIOT-OS/RIOT,thiagohd/RIOT,marcosalm/RIOT,Josar/RIOT,wentaoshang/RIOT,Lotterleben/RIOT,adjih/RIOT,plushvoxel/RIOT,RIOT-OS/RIOT,ant9000/RIOT,spium/IoT-RIOT,yogo1212/RIOT,jhollister/RIOT,mziegert/RIOT,jfischer-phytec-iot/RIOT,openkosmosorg/RIOT,A-Paul/RIOT,fnack/RIOT,abp719/RIOT,jhollister/RIOT,BytesGalore/PetersRIOT,dkm/RIOT,RBartz/RIOT,alignan/RIOT,altairpearl/RIOT,aeneby/RIOT,jasonatran/RIOT,sumanpanchal/RIOT,rfswarm/RIOT,ntrtrung/RIOT,backenklee/RIOT,biboc/RIOT,rfswarm2/RIOT,jhollister/RIOT,Ell-i/RIOT,d00616/RIOT,centurysys/RIOT,kaleb-himes/RIOT,mtausig/RIOT,hamilton-mote/RIOT-OS,jbeyerstedt/RIOT-OTA-update,sgso/RIOT,kb2ma/RIOT,patkan/RIOT,changbiao/RIOT,neumodisch/RIOT,jbeyerstedt/RIOT-OTA-update,herrfz/RIOT-old,locicontrols/RIOT,ntrtrung/RIOT,ntrtrung/RIOT,ThanhVic/RIOT,jhollister/RIOT,katezilla/RIOT,lazytech-org/RIOT,locicontrols/RIOT,LudwigKnuepfer/RIOT,phiros/RIOT,ros2/ros2_embedded_riot,miri64/RIOT,plushvoxel/RIOT,luciotorre/RIOT,herrfz/RIOT,bartfaizoltan/RIOT,MarkXYang/RIOT,kaspar030/RIOT,rakendrathapa/RIOT,MarkXYang/RIOT,jferreir/RIOT,koenning/RIOT,malosek/RIOT,sumanpanchal/RIOT,spium/IoT-RIOT,BytesGalore/RIOT,kushalsingh007/RIOT,khhhh/RIOT,MarkXYang/RIOT,ThanhVic/RIOT,zhuoshuguo/RIOT,roberthartung/RIOT,kerneltask/RIOT,thiagohd/RIOT,JensErdmann/RIOT,koenning/RIOT,attdona/RIOT,rakendrathapa/RIOT,altairpearl/RIOT,jremmert-phytec-iot/RIOT,PSHIVANI/Riot-Code,BytesGalore/PetersRIOT,RIOT-OS/RIOT,latsku/RIOT,attdona/RIOT,ximus/RIOT,kYc0o/RIOT,PSHIVANI/Riot-Code,mtausig/RIOT,arvindpdmn/RIOT,josephnoir/RIOT,haoyangyu/RIOT,Ell-i/RIOT,dailab/RIOT,EmuxEvans/RIOT,kerneltask/RIOT,lebrush/RIOT,Lotterleben/RIOT,thiagohd/RIOT,marcosalm/RIOT,plushvoxel/RIOT,emmanuelsearch/RIOT,centurysys/RIOT,neumodisch/RIOT,daniel-k/RIOT,LudwigOrtmann/RIOT,herrfz/RIOT-old,OlegHahm/RIOT,malosek/RIOT,gautric/RIOT,Lotterleben/RIOT,sgso/RIOT,immesys/RiSyn,l3nko/RIOT,hamilton-mote/RIOT-OS,tfar/RIOT,asanka-code/RIOT,automote/RIOT,rfuentess/RIOT,x3ro/RIOT,dhruvvyas90/RIOT,smlng/RIOT,1blankz7/RIOT,rfswarm2/RIOT,abkam07/RIOT,LudwigOrtmann/RIOT,immesys/RiSyn,Lotterleben/RIOT,Osblouf/RIOT,robixnai/RIOT,immesys/RiSyn,Hyungsin/RIOT-OS,locicontrols/RIOT,thiagohd/RIOT,ntrtrung/RIOT,Hyungsin/RIOT-OS,wentaoshang/RIOT,aeneby/RIOT,syin2/RIOT,rfswarm/RIOT,daniel-k/RIOT,dailab/RIOT,tfar/RIOT,jferreir/RIOT,haoyangyu/RIOT,abp719/RIOT,gautric/RIOT,smlng/RIOT,phiros/RIOT,binarylemon/RIOT,marcosalm/RIOT,mfrey/RIOT,kb2ma/RIOT,malosek/RIOT,Ell-i/RIOT,beurdouche/RIOT,Osblouf/RIOT,nsol-nmsu/RIOT,dkm/RIOT,kaspar030/RIOT,zhuoshuguo/RIOT,backenklee/RIOT,Lotterleben/RIOT,mfrey/RIOT,stevenj/RIOT,chris-wood/RIOT,locicontrols/RIOT,abkam07/RIOT,rfswarm/RIOT,tdautc19841202/RIOT,khhhh/RIOT,rfuentess/RIOT,x3ro/RIOT,jfischer-phytec-iot/RIOT,FrancescoErmini/RIOT,emmanuelsearch/RIOT,changbiao/RIOT,herrfz/RIOT-old,sumanpanchal/RIOT,spium/IoT-RIOT,jfischer-phytec-iot/RIOT,avmelnikoff/RIOT,ant9000/RIOT,latsku/RIOT,jbeyerstedt/RIOT-OTA-update,thiagohd/RIOT,Ell-i/RIOT,adjih/RIOT,msolters/RIOT,toonst/RIOT,tdautc19841202/RIOT,thomaseichinger/RIOT,khhhh/RIOT,tfar/RIOT,FrancescoErmini/RIOT,syin2/RIOT,attdona/RIOT,jferreir/RIOT,JensErdmann/RIOT,asanka-code/RIOT,ximus/RIOT,altairpearl/RIOT,hamilton-mote/RIOT-OS,AnonMall/RIOT,rfswarm2/RIOT,yogo1212/RIOT,smlng/RIOT,beurdouche/RIOT,1blankz7/RIOT,RubikonAlpha/RIOT,OlegHahm/RIOT,kushalsingh007/RIOT,chris-wood/RIOT,biboc/RIOT,changbiao/RIOT,arvindpdmn/RIOT,herrfz/RIOT,aeneby/RIOT,dhruvvyas90/RIOT,kYc0o/RIOT,DipSwitch/RIOT,RBartz/RIOT,patkan/RIOT,brettswann/RIOT,syin2/RIOT,basilfx/RIOT