tools/player: disable MSAA reconfiguration on OpenGL/Windows
tools/player: disable MSAA reconfiguration on OpenGL/Windows

The OpenGL (WGL) context initialization sets the window pixel format
which can only happen once according to the SetPixelFormat()
documentation.

This commit prevents any OpenGL context re-initialization that would
introduce a pixel format change on the SDL window by refusing any MSAA
configuration change. This prevents ngl-desktop.exe from exiting
prematurely if a MSAA change is received.

Another option would have been to re-create the SDL2 window but I
couldn't make this approach work.

Fixes #317.

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl