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xlib: fix memory leak of and remove vishandle from XMesaVisualInfo
The vishandle member of XMesaVisualInfo is used to support the
comparison of XVisualInfo instances by pointer value, in
find_glx_visual(). The comparison however will always be false, as in
every case the comparison is made, the VisualInfo instance being
compared to is a new allocation passed in through a GLX API call.
In addition, the XVisualInfo instance pointed to by vishandle is itself
never freed, causing a memory leak. Since vishandle is essentially
useless, we just remove it and thereby also fix the leak.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>