package/mpv: add optional support for OpenGLES

mpv also supports OpenGLES:
https://github.com/mpv-player/mpv/blob/master/video/out/opengl/egl_helpers.c#L98

Runtime-tested using mesa3d iris driver on a non-x11 system.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mpv/mpv.mk

@@ -140,6 +140,9 @@ endif
 ifeq ($(BR2_PACKAGE_HAS_LIBGL),y)
 MPV_CONF_OPTS += --enable-gl
 MPV_DEPENDENCIES += libgl
+else ifeq ($(BR2_PACKAGE_HAS_LIBGLES),y)
+MPV_CONF_OPTS += --enable-gl
+MPV_DEPENDENCIES += libgles
 else
 MPV_CONF_OPTS += --disable-gl
 endif