video/gtk4: Remove cfg flag for gst-gl
GTK 4 hard depends on GL on all platforms, and now both windows and macos have codepaths for the paintable sink to produce GLTextures.
This we can now drop the cfg build flag we have making it optional.
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GTK 4 hard depends on GL on all platforms, and now both windows and macos have codepaths for the paintable sink to produce GLTextures.
This we can now drop the cfg build flag we have making it optional.