launcher-util: pull in drm only for compositor-drm
launcher-util: pull in drm only for compositor-drm

Add drm_set_master and drm_drop_master
as wrappers for drm(Set|Drop)Master, when building compositor-drm
or as empty functions otherwise.

Signed-off-by: Adrian Negreanu <6275e895b07c55965e568461471033e41dc8e923@intel.com>

giucam/weston,eyolfson/weston,jonnylamb/weston,mchalupa/weston,udoprog/weston,Gnurou/weston,Tarnyko/weston-xdg_surface_present,Fantu/compositor-spice,Fantu/compositor-spice,Fantu/compositor-spice,mchalupa/weston,udoprog/weston,xorgy/weston,sir-murray/weston,Tarnyko/weston-xdg_surface_present,eyolfson/weston,giucam/weston,sir-murray/weston,Gnurou/weston,krezovic/weston,jonnylamb/weston,kwm81/weston,xorgy/weston,kwm81/weston,krezovic/weston