dist/tools: add check for extern "C" declaration
dist/tools: add check for extern "C" declaration

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