media-video/mpv: require drm with wayland+vaapi

Builds fine without and not entirely sure which configurations truly
need USE=drm (nvidia-only so I don't test vaapi), but reports show
that it's unlikely to work with (at least) wayland in 0.35.

Already enabled by default and realistically everyone with USE=wayland
and vaapi will have the deps so there's little reason to disable it.

Skipping revbump as it's not overly a problem, mostly in preparation
for stabilization in case anyone did global USE=-drm or so.

Alternatively it may make sense to drop the USE and enable by default
if a non-headless/library build, but leaving that alone for now.

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

media-video/mpv/mpv-0.35.0-r1.ebuild

@@ -37,7 +37,10 @@ REQUIRED_USE="
 	test? ( cli )
 	tools? ( cli )
 	uchardet? ( iconv )
-	vaapi? ( || ( X egl libplacebo wayland ) )
+	vaapi? (
+		|| ( X egl libplacebo wayland )
+		wayland? ( drm )
+	)
 	vdpau? ( X )
 	vulkan? ( || ( X wayland ) libplacebo )
 	xv? ( X )"

media-video/mpv/mpv-0.35.0.ebuild

@@ -37,7 +37,10 @@ REQUIRED_USE="
 	test? ( cli )
 	tools? ( cli )
 	uchardet? ( iconv )
-	vaapi? ( || ( X egl libplacebo wayland ) )
+	vaapi? (
+		|| ( X egl libplacebo wayland )
+		wayland? ( drm )
+	)
 	vdpau? ( X )
 	vulkan? ( || ( X wayland ) libplacebo )
 	xv? ( X )"

media-video/mpv/mpv-9999.ebuild

@@ -37,7 +37,10 @@ REQUIRED_USE="
 	test? ( cli )
 	tools? ( cli )
 	uchardet? ( iconv )
-	vaapi? ( || ( X egl libplacebo wayland ) )
+	vaapi? (
+		|| ( X egl libplacebo wayland )
+		wayland? ( drm )
+	)
 	vdpau? ( X )
 	vulkan? ( || ( X wayland ) libplacebo )
 	xv? ( X )"