opengl: Properly use glXQueryDrawable() to get the Visual ID

[Tomas Carnecky]

According to the spec [1] it's not allowed to use GLX_VISUAL_ID in
glXQueryDrawable(). The only way to get the Visual ID from a GLXDrawable
is to get the GLXFBConfig ID from the drawable and then the Visual ID
from the GLXFBConfig. Although GLX_VISUAL_ID may work, it kind of works
with my proprietary nvidia drivers, it's not guaranteed to yield correct
values and makes debugging hard.

Anything wrong with this patch?

ChangeLog:
 - opengl: Properly use glXQueryDrawable() to get the Visual ID

[1]
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.doc/libs/openglrf/glXQueryDrawable.htm
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