core: fix osx compile issue
core: fix osx compile issue

LudwigKnuepfer/RIOT,lazytech-org/RIOT,dkm/RIOT,immesys/RiSyn,roberthartung/RIOT,kaleb-himes/RIOT,roberthartung/RIOT,basilfx/RIOT,A-Paul/RIOT,Josar/RIOT,ant9000/RIOT,hamilton-mote/RIOT-OS,kaspar030/RIOT,Hyungsin/RIOT-OS,ks156/RIOT,adjih/RIOT,RIOT-OS/RIOT,adjih/RIOT,LudwigKnuepfer/RIOT,josephnoir/RIOT,authmillenon/RIOT,jbeyerstedt/RIOT-OTA-update,Ell-i/RIOT,hamilton-mote/RIOT-OS,aeneby/RIOT,beurdouche/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,authmillenon/RIOT,neumodisch/RIOT,miri64/RIOT,A-Paul/RIOT,dkm/RIOT,avmelnikoff/RIOT,beurdouche/RIOT,thomaseichinger/RIOT,miri64/RIOT,BytesGalore/RIOT,Josar/RIOT,basilfx/RIOT,aeneby/RIOT,dkm/RIOT,jbeyerstedt/RIOT-OTA-update,jasonatran/RIOT,cladmi/RIOT,josephnoir/RIOT,toonst/RIOT,kbumsik/RIOT,jfischer-phytec-iot/RIOT,dailab/RIOT,smlng/RIOT,TobiasFredersdorf/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,gebart/RIOT,Josar/RIOT,gautric/RIOT,avmelnikoff/RIOT,neiljay/RIOT,authmillenon/RIOT,ant9000/RIOT,aeneby/RIOT,neumodisch/RIOT,biboc/RIOT,Ell-i/RIOT,dkm/RIOT,smlng/RIOT,mfrey/RIOT,kaleb-himes/RIOT,basilfx/RIOT,LudwigOrtmann/RIOT,mtausig/RIOT,TobiasFredersdorf/RIOT,thomaseichinger/RIOT,toonst/RIOT,mtausig/RIOT,adjih/RIOT,plushvoxel/RIOT,jfischer-phytec-iot/RIOT,Hyungsin/RIOT-OS,gautric/RIOT,gebart/RIOT,adrianghc/RIOT,mfrey/RIOT,thomaseichinger/RIOT,gautric/RIOT,mfrey/RIOT,mtausig/RIOT,OTAkeys/RIOT,LudwigKnuepfer/RIOT,mfrey/RIOT,syin2/RIOT,neiljay/RIOT,LudwigKnuepfer/RIOT,A-Paul/RIOT,kerneltask/RIOT,kerneltask/RIOT,roberthartung/RIOT,neumodisch/RIOT,rfuentess/RIOT,authmillenon/RIOT,kerneltask/RIOT,jfischer-phytec-iot/RIOT,kYc0o/RIOT,plushvoxel/RIOT,aeneby/RIOT,x3ro/RIOT,adrianghc/RIOT,miri64/RIOT,neiljay/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,LudwigOrtmann/RIOT,OlegHahm/RIOT,yogo1212/RIOT,BytesGalore/RIOT,x3ro/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,beurdouche/RIOT,adrianghc/RIOT,gebart/RIOT,avmelnikoff/RIOT,gebart/RIOT,A-Paul/RIOT,cladmi/RIOT,ant9000/RIOT,immesys/RiSyn,ant9000/RIOT,miri64/RIOT,gautric/RIOT,ks156/RIOT,josephnoir/RIOT,dailab/RIOT,jasonatran/RIOT,jasonatran/RIOT,lazytech-org/RIOT,ks156/RIOT,BytesGalore/RIOT,toonst/RIOT,cladmi/RIOT,basilfx/RIOT,neumodisch/RIOT,jbeyerstedt/RIOT-OTA-update,OlegHahm/RIOT,smlng/RIOT,cladmi/RIOT,dailab/RIOT,aeneby/RIOT,OlegHahm/RIOT,neiljay/RIOT,syin2/RIOT,OlegHahm/RIOT,biboc/RIOT,Ell-i/RIOT,OTAkeys/RIOT,TobiasFredersdorf/RIOT,gebart/RIOT,avmelnikoff/RIOT,adjih/RIOT,rfuentess/RIOT,lazytech-org/RIOT,x3ro/RIOT,kaspar030/RIOT,dailab/RIOT,yogo1212/RIOT,kYc0o/RIOT,syin2/RIOT,immesys/RiSyn,authmillenon/RIOT,neiljay/RIOT,plushvoxel/RIOT,syin2/RIOT,rfuentess/RIOT,gautric/RIOT,authmillenon/RIOT,Hyungsin/RIOT-OS,roberthartung/RIOT,hamilton-mote/RIOT-OS,LudwigOrtmann/RIOT,yogo1212/RIOT,LudwigKnuepfer/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,OTAkeys/RIOT,Josar/RIOT,kbumsik/RIOT,biboc/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,kaspar030/RIOT,BytesGalore/RIOT,TobiasFredersdorf/RIOT,josephnoir/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,smlng/RIOT,immesys/RiSyn,RIOT-OS/RIOT,TobiasFredersdorf/RIOT,kYc0o/RIOT,kbumsik/RIOT,lazytech-org/RIOT,smlng/RIOT,cladmi/RIOT,kerneltask/RIOT,kaspar030/RIOT,ks156/RIOT,roberthartung/RIOT,adrianghc/RIOT,mfrey/RIOT,OTAkeys/RIOT,basilfx/RIOT,OlegHahm/RIOT,neumodisch/RIOT,biboc/RIOT,dkm/RIOT,kbumsik/RIOT,kaleb-himes/RIOT,Hyungsin/RIOT-OS,adrianghc/RIOT,plushvoxel/RIOT,jfischer-phytec-iot/RIOT,jasonatran/RIOT,yogo1212/RIOT,x3ro/RIOT,toonst/RIOT,kYc0o/RIOT,adjih/RIOT,jasonatran/RIOT,yogo1212/RIOT,toonst/RIOT,hamilton-mote/RIOT-OS,LudwigOrtmann/RIOT,avmelnikoff/RIOT,Josar/RIOT,thomaseichinger/RIOT,kbumsik/RIOT,jbeyerstedt/RIOT-OTA-update,kaspar030/RIOT,biboc/RIOT,rfuentess/RIOT,x3ro/RIOT,lazytech-org/RIOT,mtausig/RIOT,miri64/RIOT,A-Paul/RIOT,ks156/RIOT,neumodisch/RIOT,syin2/RIOT,hamilton-mote/RIOT-OS,kaleb-himes/RIOT,jfischer-phytec-iot/RIOT,beurdouche/RIOT,Hyungsin/RIOT-OS,Ell-i/RIOT,immesys/RiSyn,Ell-i/RIOT,yogo1212/RIOT,immesys/RiSyn,dailab/RIOT,thomaseichinger/RIOT,BytesGalore/RIOT,plushvoxel/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigOrtmann/RIOT,OTAkeys/RIOT,LudwigOrtmann/RIOT,ant9000/RIOT,kaleb-himes/RIOT,mtausig/RIOT,beurdouche/RIOT,RIOT-OS/RIOT,kerneltask/RIOT,rfuentess/RIOT