Of course we managed to rely on a GLSL feature that is only
in GLSL 130 and newer, not 120 which is what the default 2.1 OpenGL
contexts support on macOS.
Change-Id: Ib75e750ea15d59e51b2207669068fba7719a48b1
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
(cherry picked from commit 204c91c971dd2432af96e3586a706cdbc530e6f2)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
6f956279f8