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qtglrenderer.cc: Add missing QCoreApplication and QEventLoop includes

Michael Tretter requested to merge m.tretter/gstreamer:fix-qt-renderer-build-error into main

This fixes a build error if Qt was build without accessibility support:

../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc: In member function 'bool GstQuickRenderer::init(GstGLContext*, GError**)':
../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc:341:13: error: 'QCoreApplication' was not declared in this scope; did you mean 'QApplication'?
../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc:341:31: error: 'app' was not declared in this scope
../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc:341:37: error: 'QCoreApplication' is not a class, namespace, or enumeration

../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc:458:5: error: 'QEventLoop' was not declared in this scope; did you mean 'QEvent'?
../../../../../gstreamer/subprojects/gst-plugins-good/ext/qt/qtglrenderer.cc:459:9: error: 'loop' was not declared in this scope

If accessibility is enabled, the includes for QCoreApplication and QEventLoop are indirectly pulled via QWidget.

Add the required headers as documented in [1] and [2].

[1] https://doc.qt.io/qt-5/qcoreapplication.html

[2] https://doc.qt.io/qt-5/qeventloop.html

@pH5

Edited by Michael Tretter

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