[1.19.1] qmlglsink on Windows

[Ilya Aleshkov]

Hi,

I've tried to touch the qmlglsink plugin with GStreamer 1.19.1 but with no
success (Qt 5.13.2 MSVC 2017 64bit or Qt 5.15.2 MSVC 2019 bit).
I've got an error inside the gst_gl_context_get_current_gl_api() method:
Exception at 0x80000000, code: 0xc0000005: write access violation at:
0x80000000, flags=0x0 (first chance)

Call stack:
gst_gl_context_get_current_gl_api()         |  gstglcontext.c
gst_qt_get_gl_wrapcontext()                     |  gstqtglutility.cc
QtGLWindow::onSceneGraphInitialized()  |  qtwindow.cc

It looks like a regression.
I've been using qmlglsink since GStreamer 1.14.4 (and up to 1.18.4) without
any issues.

Thanks,
Ilya
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