mesa: Add explicit target checking to GetTexLevelParameter[if]v().

mesa: Add explicit target checking to GetTexLevelParameter[if]v().

Previously, it relied on _mesa_max_texture_levels() for texture target
error checking.  This was somewhat dodgy, as _mesa_max_texture_levels()
is called in seven diferent places, not all of which necessarily accept
the same list of targets.

I copied the list of legal targets from _mesa_max_texture_levels(), so
this patch should not introduce any change in behavior.  Future patches
will cause the two to diverge.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>