x11-wm/gamescope: check libliftoff package version after ef2d0a35dd40

Dependency libliftoff found: NO found 0.1.0 but need: '>= 0.2.0' ; matched: '< 0.3.0'

../src/drm.cpp:1174:8: error: use of undeclared identifier 'liftoff_output_needs_composition'

if ( liftoff_output_needs_composition( drm->lo_output ) )
     ^