games-fps/yamagi-quake2: adjust opengl/gles deps

Mesa is the vendor which could be something else (aka nvidia), and
not much sense in checking directly. On the other hand, I needed to
enable gles2 on libsdl2 (flag handles gles3 too) or it'd complain
when I tried to use it, or at least with libsdl2[-opengl].

virtual/opengl is also mostly deprecated, so switch to libglvnd (this
is not wired to use libOpenGL over libGL so still need [X]).

Also add gles as a REQUIRED_USE option, I could USE="client gles -*"
with libsdl2[-opengl,gles2] and run this with +set vid_renderer gles3.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-fps/yamagi-quake2/yamagi-quake2-8.10.ebuild

@@ -27,17 +27,20 @@ KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"
 IUSE="+client ctf dedicated gles openal +opengl rogue softrender vulkan xatrix"
 REQUIRED_USE="
 	|| ( client dedicated )
-	client? ( || ( opengl softrender vulkan ) )
+	client? ( || ( opengl gles softrender vulkan ) )
 "
 
 RDEPEND="
 	client? (
 		media-libs/libsdl2[opengl?,video,vulkan?]
 		net-misc/curl
+		gles? (
+			media-libs/libglvnd
+			media-libs/libsdl2[gles2]
+		)
 		openal? ( media-libs/openal )
 		!openal? ( media-libs/libsdl2[sound] )
-		opengl? ( virtual/opengl )
-		gles? ( media-libs/mesa[gles2] )
+		opengl? ( media-libs/libglvnd[X] )
 	)
 "
 DEPEND="${RDEPEND}