[gtk: 4/4] Merge branch 'gst.gl.win32' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit f1f225c6b3bd8fb006618eab1b7c3455d663f1ba
Merge: 21057fb857 16f307b305
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon May 24 11:37:06 2021 +0000

    Merge branch 'gst.gl.win32' into 'master'
    
    media/gstreamer: Support using GL for video for Windows
    
    See merge request GNOME/gtk!3506

 gdk/win32/gdkglcontext-win32.c  |  36 +++++++--
 modules/media/gtkgstpaintable.c |  42 +++++-----
 modules/media/gtkgstsink.c      | 174 +++++++++++++++++++++++++++++++++++-----
 modules/media/meson.build       |  17 +++-
 4 files changed, 223 insertions(+), 46 deletions(-)
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