[Buildroot] [git commit branch/next] package/mpv: fix build of vaapi with egl-drm

commit: https://git.buildroot.net/buildroot/commit/?id=6fdac7fd193507789b568d5e6839e6d100edbf26
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

Build of vaapi with egl-drm is broken since commit
6ec47c4e59c7c8c57e972dab985c8a2ba0bf7174 because egl-drm is a part of gl
group which is only enabled if BR2_PACKAGE_HAS_LIBGL or
BR2_PACKAGE_HAS_LIBGLES are set:
https://github.com/mpv-player/mpv/blob/ec0006bfa1aaf608a7141929f2871c89ac7a15d6/wscript#L572

As a result, despite what is being displayed in the autobuilder log
message, the build failure is not related to X11 but to the fact that
we try to enable vaapi through egl-drm but at the same time, we disable
gl.

To fix it, enable gl if libegl is available as gl can be enabled for
example through wayland and egl (gl-wayland):

'deps': 'gl-cocoa || gl-x11 || egl-x11 || egl-drm || '
+ 'gl-win32 || gl-wayland || rpi || '
+ 'plain-gl',

Fixes:
 - http://autobuild.buildroot.org/results/e5c15228f42a73f8c34b26630b2074c30e5f5966

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Yann E. MORIN <redacted>
---
 package/mpv/mpv.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/package/mpv/mpv.mk b/package/mpv/mpv.mk
index 91e31dd150..f8ecaeb78a 100644
--- a/package/mpv/mpv.mk
+++ b/package/mpv/mpv.mk

@@ -148,6 +148,9 @@ MPV_DEPENDENCIES += libgl
 else ifeq ($(BR2_PACKAGE_HAS_LIBGLES),y)
 MPV_CONF_OPTS += --enable-gl
 MPV_DEPENDENCIES += libgles
+else ifeq ($(BR2_PACKAGE_HAS_LIBEGL),y)
+MPV_CONF_OPTS += --enable-gl
+MPV_DEPENDENCIES += libegl
 else
 MPV_CONF_OPTS += --disable-gl
 endif

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