[1/2] winex11.drv: Make wglShareLists() cope with previously selected destination context (try 4)

[Jim Cameron]

The current wglShareLists() will fail if the destination context has ever been made current. This causes a crash in Homeworld 2, unless pbuffers are disabled. This patch fixes the crash by deleting and recreating the underlying OpenGL context, unless it is still current in some thread.

Added a conformance test.
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