[gtk: 2/2] Merge branch 'win32-check-shader-support' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 5707b80a6997a4c5028cd8e4535a0475163a7430
Merge: 81e5d4c327 5d0f188615
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Aug 18 12:19:57 2021 +0000

    Merge branch 'win32-check-shader-support' into 'master'
    
    GDK-Win32: Reject GL context if shaders aren't supported (fix issue #4165)
    
    Closes #4165
    
    See merge request GNOME/gtk!3850

 gdk/win32/gdkglcontext-win32-egl.c |  2 +-
 gdk/win32/gdkglcontext-win32-wgl.c | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
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