Makefile.include: fail by default when errors are expected
Makefile.include: fail by default when errors are expected

The build can still be forced by adding WERROR=0 to the command line

yogo1212/RIOT,josephnoir/RIOT,authmillenon/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,josephnoir/RIOT,kYc0o/RIOT,aeneby/RIOT,ant9000/RIOT,yogo1212/RIOT,yogo1212/RIOT,jasonatran/RIOT,OlegHahm/RIOT,x3ro/RIOT,OTAkeys/RIOT,kYc0o/RIOT,miri64/RIOT,x3ro/RIOT,jasonatran/RIOT,jasonatran/RIOT,authmillenon/RIOT,smlng/RIOT,kaspar030/RIOT,jasonatran/RIOT,OTAkeys/RIOT,miri64/RIOT,OlegHahm/RIOT,smlng/RIOT,mtausig/RIOT,kaspar030/RIOT,yogo1212/RIOT,smlng/RIOT,aeneby/RIOT,OlegHahm/RIOT,authmillenon/RIOT,ant9000/RIOT,aeneby/RIOT,miri64/RIOT,smlng/RIOT,OlegHahm/RIOT,aeneby/RIOT,toonst/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,authmillenon/RIOT,x3ro/RIOT,RIOT-OS/RIOT,josephnoir/RIOT,ant9000/RIOT,OTAkeys/RIOT,ant9000/RIOT,miri64/RIOT,basilfx/RIOT,toonst/RIOT,x3ro/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,ant9000/RIOT,basilfx/RIOT,miri64/RIOT,mtausig/RIOT,mtausig/RIOT,yogo1212/RIOT,josephnoir/RIOT,authmillenon/RIOT,basilfx/RIOT,smlng/RIOT,basilfx/RIOT,mtausig/RIOT,kaspar030/RIOT,aeneby/RIOT,kaspar030/RIOT,toonst/RIOT,OlegHahm/RIOT,toonst/RIOT,mtausig/RIOT,x3ro/RIOT,authmillenon/RIOT,kYc0o/RIOT,yogo1212/RIOT,kaspar030/RIOT,OTAkeys/RIOT,josephnoir/RIOT,basilfx/RIOT,OTAkeys/RIOT,toonst/RIOT