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VLCOpenGLES2VideoView: remove EAGL context in close

Alexandre Janniaux requested to merge alexandre-janniaux/vlc:eagl-fixups/1 into master

Fix a crash where the destructor of the VLCOpenGLES2VideoView (.cxx_destruct) is calling the destructor of the EAGL context, which leads into unknown stacktraces in the EAGLContext_setDebugLabel symbol.

The setup of the crash needs using CVPixelBuffer backed by an IOSurface, so typically a filter using the VLCCVOpenGLProvider offscreen OpenGL implementation, which seems to imply some live-binding is still in use if we don't close the context soon enough.

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VideoLAN code repository instance