package/gstreamer1/gst1-plugins-base: gl needs api, platform and window

package/gstreamer1/gst1-plugins-base: gl needs api, platform and window

Build will fail if gl is enabled without an api, a platform and a
window:

Message: No OpenGL Platforms found or requested
Message: No OpenGL Window systems found or requested

gst-libs/gst/gl/meson.build:948:2: ERROR: Problem encountered: GStreamer OpenGL integration required via options, but needed dependencies not found.

This requirement is already specified in Config.in through a simple
comment:

comment "The opengl library needs an API, a platform and a window system"
	depends on !BR2_PACKAGE_GST1_PLUGINS_BASE_HAS_LIB_OPENGL

Fixes:
 - http://autobuild.buildroot.org/results/d171059801adf8dea1a2116d7c729a2aa5767ac8
 - http://autobuild.buildroot.org/results/b1bfa505bba534440d331c4948eea5eb2d165c97

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>