loader_dri3/glx/egl: Optionally use a blit context for blitting operations

The code was relying on us always having a current context for client local
image blit operations. Otherwise the blit would be skipped. However,
glxSwapBuffers, for example, doesn't require a current context and that was a
common problem in the dri1 era. It seems the problem has resurfaced with dri3.

If we don't have a current context when we want to blit, try creating a private
dri context and maintain a context cache of a single context.

Signed-off-by: Thomas Hellstrom <[email protected]>
Reviewed-by: Michel Dänzer <[email protected]>

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