unittests/tests-pktqueue: fixed header file include guard
unittests/tests-pktqueue: fixed header file include guard

fixes #2623
gautric/RIOT,hamilton-mote/RIOT-OS,dailab/RIOT,kerneltask/RIOT,LudwigOrtmann/RIOT,adrianghc/RIOT,rajma996/RIOT,Osblouf/RIOT,attdona/RIOT,lebrush/RIOT,abkam07/RIOT,RBartz/RIOT,malosek/RIOT,herrfz/RIOT,openkosmosorg/RIOT,RubikonAlpha/RIOT,dhruvvyas90/RIOT,Darredevil/RIOT,avmelnikoff/RIOT,thiagohd/RIOT,mfrey/RIOT,jbeyerstedt/RIOT-OTA-update,herrfz/RIOT,neiljay/RIOT,koenning/RIOT,ximus/RIOT,lebrush/RIOT,zhuoshuguo/RIOT,PSHIVANI/Riot-Code,OTAkeys/RIOT,haoyangyu/RIOT,openkosmosorg/RIOT,yogo1212/RIOT,koenning/RIOT,FrancescoErmini/RIOT,EmuxEvans/RIOT,lazytech-org/RIOT,OlegHahm/RIOT,EmuxEvans/RIOT,x3ro/RIOT,tdautc19841202/RIOT,zhuoshuguo/RIOT,tdautc19841202/RIOT,kushalsingh007/RIOT,MohmadAyman/RIOT,abp719/RIOT,OTAkeys/RIOT,thiagohd/RIOT,marcosalm/RIOT,rfswarm/RIOT,JensErdmann/RIOT,chris-wood/RIOT,robixnai/RIOT,dhruvvyas90/RIOT,benoit-canet/RIOT,msolters/RIOT,chris-wood/RIOT,msolters/RIOT,d00616/RIOT,miri64/RIOT,neumodisch/RIOT,A-Paul/RIOT,gbarnett/RIOT,arvindpdmn/RIOT,daniel-k/RIOT,herrfz/RIOT-old,x3ro/RIOT,benoit-canet/RIOT,malosek/RIOT,sumanpanchal/RIOT,dailab/RIOT,yogo1212/RIOT,luciotorre/RIOT,ant9000/RIOT,attdona/RIOT,herrfz/RIOT,lebrush/RIOT,lazytech-org/RIOT,dhruvvyas90/RIOT,stevenj/RIOT,mtausig/RIOT,latsku/RIOT,centurysys/RIOT,bartfaizoltan/RIOT,sgso/RIOT,zhuoshuguo/RIOT,ximus/RIOT,PSHIVANI/Riot-Code,authmillenon/RIOT,kaspar030/RIOT,wentaoshang/RIOT,zhuoshuguo/RIOT,ks156/RIOT,yogo1212/RIOT,jremmert-phytec-iot/RIOT,x3ro/RIOT,neumodisch/RIOT,jremmert-phytec-iot/RIOT,biboc/RIOT,rfswarm/RIOT,katezilla/RIOT,centurysys/RIOT,mfrey/RIOT,bartfaizoltan/RIOT,Josar/RIOT,ntrtrung/RIOT,tdautc19841202/RIOT,RubikonAlpha/RIOT,cladmi/RIOT,JensErdmann/RIOT,ks156/RIOT,brettswann/RIOT,alex1818/RIOT,jferreir/RIOT,adrianghc/RIOT,ant9000/RIOT,gbarnett/RIOT,msolters/RIOT,sumanpanchal/RIOT,kerneltask/RIOT,openkosmosorg/RIOT,dkm/RIOT,daniel-k/RIOT,thiagohd/RIOT,stevenj/RIOT,thomaseichinger/RIOT,RIOT-OS/RIOT,Osblouf/RIOT,MohmadAyman/RIOT,aeneby/RIOT,watr-li/RIOT,rousselk/RIOT,jfischer-phytec-iot/RIOT,marcosalm/RIOT,ThanhVic/RIOT,lazytech-org/RIOT,kb2ma/RIOT,beurdouche/RIOT,patkan/RIOT,toonst/RIOT,bartfaizoltan/RIOT,rousselk/RIOT,syin2/RIOT,rajma996/RIOT,FrancescoErmini/RIOT,biboc/RIOT,tfar/RIOT,gebart/RIOT,shady33/RIOT,hamilton-mote/RIOT-OS,automote/RIOT,jbeyerstedt/RIOT-OTA-update,adrianghc/RIOT,robixnai/RIOT,aeneby/RIOT,l3nko/RIOT,A-Paul/RIOT,ntrtrung/RIOT,Yonezawa-T2/RIOT,tfar/RIOT,yogo1212/RIOT,basilfx/RIOT,TobiasFredersdorf/RIOT,basilfx/RIOT,haoyangyu/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,kaleb-himes/RIOT,OlegHahm/RIOT,kbumsik/RIOT,BytesGalore/RIOT,A-Paul/RIOT,khhhh/RIOT,malosek/RIOT,l3nko/RIOT,roberthartung/RIOT,katezilla/RIOT,alex1818/RIOT,kushalsingh007/RIOT,avmelnikoff/RIOT,ntrtrung/RIOT,avmelnikoff/RIOT,kbumsik/RIOT,jfischer-phytec-iot/RIOT,jferreir/RIOT,sgso/RIOT,attdona/RIOT,luciotorre/RIOT,robixnai/RIOT,asanka-code/RIOT,basilfx/RIOT,rajma996/RIOT,brettswann/RIOT,ximus/RIOT,rousselk/RIOT,l3nko/RIOT,herrfz/RIOT-old,kerneltask/RIOT,immesys/RiSyn,smlng/RIOT,mziegert/RIOT,plushvoxel/RIOT,backenklee/RIOT,MarkXYang/RIOT,JensErdmann/RIOT,kaleb-himes/RIOT,hamilton-mote/RIOT-OS,Hyungsin/RIOT-OS,mtausig/RIOT,altairpearl/RIOT,plushvoxel/RIOT,robixnai/RIOT,toonst/RIOT,kb2ma/RIOT,tfar/RIOT,asanka-code/RIOT,stevenj/RIOT,shady33/RIOT,beurdouche/RIOT,MarkXYang/RIOT,LudwigKnuepfer/RIOT,msolters/RIOT,brettswann/RIOT,TobiasFredersdorf/RIOT,yogo1212/RIOT,MonsterCode8000/RIOT,rfswarm/RIOT,LudwigOrtmann/RIOT,openkosmosorg/RIOT,hamilton-mote/RIOT-OS,stevenj/RIOT,Darredevil/RIOT,cladmi/RIOT,jbeyerstedt/RIOT-OTA-update,kaspar030/RIOT,latsku/RIOT,LudwigKnuepfer/RIOT,asanka-code/RIOT,toonst/RIOT,jasonatran/RIOT,gebart/RIOT,kushalsingh007/RIOT,PSHIVANI/Riot-Code,khhhh/RIOT,smlng/RIOT,mziegert/RIOT,asanka-code/RIOT,binarylemon/RIOT,MonsterCode8000/RIOT,gebart/RIOT,rakendrathapa/RIOT,altairpearl/RIOT,centurysys/RIOT,changbiao/RIOT,PSHIVANI/Riot-Code,Lexandro92/RIOT-CoAP,basilfx/RIOT,RubikonAlpha/RIOT,zhuoshuguo/RIOT,latsku/RIOT,centurysys/RIOT,tdautc19841202/RIOT,asanka-code/RIOT,roberthartung/RIOT,LudwigKnuepfer/RIOT,centurysys/RIOT,stevenj/RIOT,Josar/RIOT,biboc/RIOT,miri64/RIOT,authmillenon/RIOT,neumodisch/RIOT,EmuxEvans/RIOT,rajma996/RIOT,dailab/RIOT,herrfz/RIOT,Hyungsin/RIOT-OS,abp719/RIOT,phiros/RIOT,mfrey/RIOT,benoit-canet/RIOT,LudwigOrtmann/RIOT,watr-li/RIOT,neumodisch/RIOT,rfuentess/RIOT,MonsterCode8000/RIOT,robixnai/RIOT,daniel-k/RIOT,daniel-k/RIOT,abkam07/RIOT,MonsterCode8000/RIOT,dailab/RIOT,kb2ma/RIOT,A-Paul/RIOT,koenning/RIOT,neiljay/RIOT,avmelnikoff/RIOT,Lexandro92/RIOT-CoAP,JensErdmann/RIOT,jfischer-phytec-iot/RIOT,MarkXYang/RIOT,tfar/RIOT,arvindpdmn/RIOT,jferreir/RIOT,plushvoxel/RIOT,katezilla/RIOT,alex1818/RIOT,x3ro/RIOT,alignan/RIOT,bartfaizoltan/RIOT,Osblouf/RIOT,RBartz/RIOT,jasonatran/RIOT,DipSwitch/RIOT,kbumsik/RIOT,RIOT-OS/RIOT,d00616/RIOT,Osblouf/RIOT,MonsterCode8000/RIOT,l3nko/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,LudwigOrtmann/RIOT,ximus/RIOT,luciotorre/RIOT,rakendrathapa/RIOT,alignan/RIOT,gbarnett/RIOT,sgso/RIOT,kYc0o/RIOT,basilfx/RIOT,Darredevil/RIOT,marcosalm/RIOT,kYc0o/RIOT,fnack/RIOT,brettswann/RIOT,abp719/RIOT,josephnoir/RIOT,toonst/RIOT,koenning/RIOT,ntrtrung/RIOT,Darredevil/RIOT,plushvoxel/RIOT,altairpearl/RIOT,roberthartung/RIOT,ant9000/RIOT,watr-li/RIOT,TobiasFredersdorf/RIOT,zhuoshuguo/RIOT,smlng/RIOT,abkam07/RIOT,watr-li/RIOT,backenklee/RIOT,MohmadAyman/RIOT,abkam07/RIOT,jferreir/RIOT,patkan/RIOT,adjih/RIOT,OTAkeys/RIOT,herrfz/RIOT-old,kerneltask/RIOT,haoyangyu/RIOT,altairpearl/RIOT,BytesGalore/RIOT,syin2/RIOT,tdautc19841202/RIOT,rakendrathapa/RIOT,kaspar030/RIOT,katezilla/RIOT,Lexandro92/RIOT-CoAP,jremmert-phytec-iot/RIOT,jbeyerstedt/RIOT-OTA-update,malosek/RIOT,ntrtrung/RIOT,gebart/RIOT,alignan/RIOT,thomaseichinger/RIOT,BytesGalore/RIOT,kYc0o/RIOT,immesys/RiSyn,tfar/RIOT,Darredevil/RIOT,jferreir/RIOT,attdona/RIOT,mziegert/RIOT,syin2/RIOT,EmuxEvans/RIOT,thomaseichinger/RIOT,abkam07/RIOT,automote/RIOT,rousselk/RIOT,latsku/RIOT,cladmi/RIOT,koenning/RIOT,dkm/RIOT,kushalsingh007/RIOT,beurdouche/RIOT,thiagohd/RIOT,gbarnett/RIOT,jasonatran/RIOT,phiros/RIOT,jfischer-phytec-iot/RIOT,josephnoir/RIOT,daniel-k/RIOT,dailab/RIOT,MohmadAyman/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,DipSwitch/RIOT,kaleb-himes/RIOT,sumanpanchal/RIOT,backenklee/RIOT,miri64/RIOT,wentaoshang/RIOT,changbiao/RIOT,lebrush/RIOT,arvindpdmn/RIOT,gbarnett/RIOT,rousselk/RIOT,mtausig/RIOT,beurdouche/RIOT,Yonezawa-T2/RIOT,Lexandro92/RIOT-CoAP,rajma996/RIOT,dkm/RIOT,abkam07/RIOT,syin2/RIOT,fnack/RIOT,PSHIVANI/Riot-Code,MohmadAyman/RIOT,khhhh/RIOT,MarkXYang/RIOT,wentaoshang/RIOT,syin2/RIOT,kaleb-himes/RIOT,arvindpdmn/RIOT,katezilla/RIOT,patkan/RIOT,miri64/RIOT,dkm/RIOT,Yonezawa-T2/RIOT,luciotorre/RIOT,dhruvvyas90/RIOT,neumodisch/RIOT,cladmi/RIOT,MarkXYang/RIOT,A-Paul/RIOT,bartfaizoltan/RIOT,d00616/RIOT,roberthartung/RIOT,RBartz/RIOT,Josar/RIOT,ant9000/RIOT,fnack/RIOT,RubikonAlpha/RIOT,automote/RIOT,benoit-canet/RIOT,wentaoshang/RIOT,FrancescoErmini/RIOT,rousselk/RIOT,ntrtrung/RIOT,DipSwitch/RIOT,openkosmosorg/RIOT,immesys/RiSyn,Lexandro92/RIOT-CoAP,mfrey/RIOT,neiljay/RIOT,gautric/RIOT,ks156/RIOT,dhruvvyas90/RIOT,OTAkeys/RIOT,Yonezawa-T2/RIOT,rajma996/RIOT,Josar/RIOT,marcosalm/RIOT,Yonezawa-T2/RIOT,roberthartung/RIOT,lebrush/RIOT,brettswann/RIOT,hamilton-mote/RIOT-OS,DipSwitch/RIOT,ximus/RIOT,arvindpdmn/RIOT,yogo1212/RIOT,msolters/RIOT,automote/RIOT,kaspar030/RIOT,smlng/RIOT,Ell-i/RIOT,rfuentess/RIOT,RBartz/RIOT,OlegHahm/RIOT,gbarnett/RIOT,neumodisch/RIOT,gautric/RIOT,automote/RIOT,fnack/RIOT,rfswarm/RIOT,sgso/RIOT,chris-wood/RIOT,jremmert-phytec-iot/RIOT,arvindpdmn/RIOT,mtausig/RIOT,aeneby/RIOT,changbiao/RIOT,authmillenon/RIOT,alex1818/RIOT,patkan/RIOT,alignan/RIOT,msolters/RIOT,herrfz/RIOT-old,foss-for-synopsys-dwc-arc-processors/RIOT,jasonatran/RIOT,jfischer-phytec-iot/RIOT,kbumsik/RIOT,herrfz/RIOT,bartfaizoltan/RIOT,mziegert/RIOT,BytesGalore/RIOT,d00616/RIOT,d00616/RIOT,patkan/RIOT,plushvoxel/RIOT,attdona/RIOT,Lexandro92/RIOT-CoAP,dhruvvyas90/RIOT,jferreir/RIOT,FrancescoErmini/RIOT,backenklee/RIOT,rfswarm/RIOT,Hyungsin/RIOT-OS,wentaoshang/RIOT,benoit-canet/RIOT,kaspar030/RIOT,jasonatran/RIOT,cladmi/RIOT,Ell-i/RIOT,shady33/RIOT,kushalsingh007/RIOT,EmuxEvans/RIOT,LudwigOrtmann/RIOT,backenklee/RIOT,neiljay/RIOT,phiros/RIOT,sumanpanchal/RIOT,RIOT-OS/RIOT,adjih/RIOT,Osblouf/RIOT,Ell-i/RIOT,malosek/RIOT,ks156/RIOT,watr-li/RIOT,OlegHahm/RIOT,binarylemon/RIOT,haoyangyu/RIOT,Ell-i/RIOT,khhhh/RIOT,ThanhVic/RIOT,herrfz/RIOT-old,kaleb-himes/RIOT,Ell-i/RIOT,fnack/RIOT,chris-wood/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,RubikonAlpha/RIOT,binarylemon/RIOT,alex1818/RIOT,rfuentess/RIOT,thomaseichinger/RIOT,ant9000/RIOT,miri64/RIOT,rakendrathapa/RIOT,gautric/RIOT,jbeyerstedt/RIOT-OTA-update,rfuentess/RIOT,MarkXYang/RIOT,latsku/RIOT,centurysys/RIOT,chris-wood/RIOT,Darredevil/RIOT,ThanhVic/RIOT,jremmert-phytec-iot/RIOT,stevenj/RIOT,binarylemon/RIOT,RBartz/RIOT,EmuxEvans/RIOT,robixnai/RIOT,koenning/RIOT,phiros/RIOT,altairpearl/RIOT,Osblouf/RIOT,benoit-canet/RIOT,abp719/RIOT,dkm/RIOT,JensErdmann/RIOT,kYc0o/RIOT,automote/RIOT,adrianghc/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,latsku/RIOT,ximus/RIOT,openkosmosorg/RIOT,binarylemon/RIOT,Hyungsin/RIOT-OS,x3ro/RIOT,herrfz/RIOT,ThanhVic/RIOT,thiagohd/RIOT,thiagohd/RIOT,authmillenon/RIOT,OlegHahm/RIOT,toonst/RIOT,LudwigKnuepfer/RIOT,phiros/RIOT,neiljay/RIOT,shady33/RIOT,gautric/RIOT,luciotorre/RIOT,aeneby/RIOT,khhhh/RIOT,chris-wood/RIOT,alex1818/RIOT,immesys/RiSyn,changbiao/RIOT,abp719/RIOT,altairpearl/RIOT,kb2ma/RIOT,sgso/RIOT,daniel-k/RIOT,RIOT-OS/RIOT,d00616/RIOT,MohmadAyman/RIOT,phiros/RIOT,MonsterCode8000/RIOT,shady33/RIOT,shady33/RIOT,authmillenon/RIOT,haoyangyu/RIOT,brettswann/RIOT,kYc0o/RIOT,ThanhVic/RIOT,haoyangyu/RIOT,immesys/RiSyn,mfrey/RIOT,l3nko/RIOT,marcosalm/RIOT,tdautc19841202/RIOT,lazytech-org/RIOT,avmelnikoff/RIOT,aeneby/RIOT,khhhh/RIOT,RubikonAlpha/RIOT,watr-li/RIOT,mziegert/RIOT,biboc/RIOT,thomaseichinger/RIOT,lazytech-org/RIOT,FrancescoErmini/RIOT,gebart/RIOT,fnack/RIOT,BytesGalore/RIOT,kb2ma/RIOT,l3nko/RIOT,JensErdmann/RIOT,patkan/RIOT,TobiasFredersdorf/RIOT,josephnoir/RIOT,changbiao/RIOT,jremmert-phytec-iot/RIOT,rakendrathapa/RIOT,ks156/RIOT,beurdouche/RIOT,josephnoir/RIOT,DipSwitch/RIOT,binarylemon/RIOT,kbumsik/RIOT,ThanhVic/RIOT,alignan/RIOT,FrancescoErmini/RIOT,mtausig/RIOT,PSHIVANI/Riot-Code,wentaoshang/RIOT,lebrush/RIOT,Josar/RIOT,asanka-code/RIOT,rakendrathapa/RIOT,RBartz/RIOT,biboc/RIOT,malosek/RIOT,authmillenon/RIOT,changbiao/RIOT,abp719/RIOT,sumanpanchal/RIOT,smlng/RIOT,immesys/RiSyn,sumanpanchal/RIOT,luciotorre/RIOT,adrianghc/RIOT,rfswarm/RIOT,DipSwitch/RIOT,kerneltask/RIOT,RIOT-OS/RIOT,kushalsingh007/RIOT,attdona/RIOT,marcosalm/RIOT,Hyungsin/RIOT-OS,josephnoir/RIOT,sgso/RIOT,TobiasFredersdorf/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,Yonezawa-T2/RIOT,adjih/RIOT,adjih/RIOT,mziegert/RIOT,adjih/RIOT