Merge branch 'mm/makefile-developer-can-be-in-config-mak'

"make DEVELOPER=1" worked as expected; setting DEVELOPER=1 in config.mak didn't. * mm/makefile-developer-can-be-in-config-mak: Makefile: add $(DEVELOPER_CFLAGS) variable Makefile: move 'ifdef DEVELOPER' after config.mak* inclusion