Makefile.include: always include board Makefile.features
Makefile.include: always include board Makefile.features

makefiles/info-global.inc.mk already includes this file unconditionally.
So it is misleading to say it is optional.

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