media-sound/carla: add pugl support, fix X11 dep

This finally fixes the build errors when USE="-X" is used to build
carla, as this requires gui-libs/pugl instead of libX11. Also, X support
doesn't need a full X server, but only libX11, which finally allows
installing and running media-sound/carla[X] on Wayland.

Closes: gentoo-audio#528

Author: NexAdn

media-sound/carla/carla-2.5.2.ebuild media-sound/carla/carla-2.5.2-r1.ebuild

@@ -39,7 +39,9 @@ RDEPEND="${PYTHON_DEPS}
 	rdf? ( dev-python/rdflib )
 	sf2? ( media-sound/fluidsynth )
 	sndfile? ( media-libs/libsndfile )
-	X? ( x11-base/xorg-server )"
+	X? ( x11-libs/libX11 )
+	!X? ( gui-libs/pugl:= )
+"
 DEPEND=${RDEPEND}
 
 src_prepare() {