tests/xtimer_usleep_short: make Makefile adhere to conventions
tests/xtimer_usleep_short: make Makefile adhere to conventions

OlegHahm/RIOT,authmillenon/RIOT,roberthartung/RIOT,jasonatran/RIOT,neiljay/RIOT,x3ro/RIOT,basilfx/RIOT,basilfx/RIOT,toonst/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,avmelnikoff/RIOT,miri64/RIOT,cladmi/RIOT,BytesGalore/RIOT,RIOT-OS/RIOT,cladmi/RIOT,mfrey/RIOT,gebart/RIOT,josephnoir/RIOT,authmillenon/RIOT,kYc0o/RIOT,LudwigOrtmann/RIOT,jasonatran/RIOT,neiljay/RIOT,OlegHahm/RIOT,ant9000/RIOT,biboc/RIOT,yogo1212/RIOT,immesys/RiSyn,kaspar030/RIOT,LudwigKnuepfer/RIOT,OTAkeys/RIOT,gebart/RIOT,aeneby/RIOT,A-Paul/RIOT,avmelnikoff/RIOT,kbumsik/RIOT,josephnoir/RIOT,miri64/RIOT,cladmi/RIOT,kYc0o/RIOT,kYc0o/RIOT,biboc/RIOT,LudwigOrtmann/RIOT,mtausig/RIOT,yogo1212/RIOT,yogo1212/RIOT,A-Paul/RIOT,miri64/RIOT,roberthartung/RIOT,BytesGalore/RIOT,authmillenon/RIOT,LudwigKnuepfer/RIOT,x3ro/RIOT,x3ro/RIOT,gebart/RIOT,josephnoir/RIOT,neiljay/RIOT,roberthartung/RIOT,roberthartung/RIOT,kbumsik/RIOT,LudwigOrtmann/RIOT,basilfx/RIOT,smlng/RIOT,LudwigKnuepfer/RIOT,immesys/RiSyn,OTAkeys/RIOT,immesys/RiSyn,lazytech-org/RIOT,rfuentess/RIOT,smlng/RIOT,RIOT-OS/RIOT,lazytech-org/RIOT,cladmi/RIOT,toonst/RIOT,josephnoir/RIOT,ant9000/RIOT,mfrey/RIOT,BytesGalore/RIOT,Josar/RIOT,Josar/RIOT,biboc/RIOT,aeneby/RIOT,OTAkeys/RIOT,BytesGalore/RIOT,aeneby/RIOT,jasonatran/RIOT,rfuentess/RIOT,aeneby/RIOT,x3ro/RIOT,Josar/RIOT,A-Paul/RIOT,immesys/RiSyn,LudwigKnuepfer/RIOT,toonst/RIOT,gebart/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,jasonatran/RIOT,lazytech-org/RIOT,LudwigOrtmann/RIOT,kbumsik/RIOT,lazytech-org/RIOT,Josar/RIOT,toonst/RIOT,BytesGalore/RIOT,mfrey/RIOT,kaspar030/RIOT,mtausig/RIOT,authmillenon/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OlegHahm/RIOT,aeneby/RIOT,ant9000/RIOT,biboc/RIOT,RIOT-OS/RIOT,A-Paul/RIOT,miri64/RIOT,OTAkeys/RIOT,cladmi/RIOT,kaspar030/RIOT,smlng/RIOT,LudwigOrtmann/RIOT,avmelnikoff/RIOT,jasonatran/RIOT,yogo1212/RIOT,mtausig/RIOT,kbumsik/RIOT,miri64/RIOT,avmelnikoff/RIOT,gebart/RIOT,A-Paul/RIOT,neiljay/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,kaspar030/RIOT,mfrey/RIOT,neiljay/RIOT,ant9000/RIOT,roberthartung/RIOT,basilfx/RIOT,kaspar030/RIOT,smlng/RIOT,rfuentess/RIOT,yogo1212/RIOT,kYc0o/RIOT,yogo1212/RIOT,OlegHahm/RIOT,mtausig/RIOT,smlng/RIOT,immesys/RiSyn,lazytech-org/RIOT,avmelnikoff/RIOT,kYc0o/RIOT,Josar/RIOT,biboc/RIOT,mtausig/RIOT,rfuentess/RIOT,x3ro/RIOT,toonst/RIOT,immesys/RiSyn,LudwigKnuepfer/RIOT,kbumsik/RIOT,ant9000/RIOT,basilfx/RIOT,mfrey/RIOT