sys/embunit: Fix incompatible declaration in outputter.
sys/embunit: Fix incompatible declaration in outputter.

OutputterPrintHeaderFunction is declared as a function of 1 parameter
but CompilerOutputter_printHeader was defined as taking 2.

It is a mystery why this code compiled before.

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