mesa/formatquery: limit ES target support, fix core context support

mesa/formatquery: limit ES target support, fix core context support

First off, as late as ES 3.2, GetInternalformat only supports
RENDERBUFFER and 2DMS(_ARRAY) targets.

Secondly, the _mesa_has_ext helpers are very accurate... a little too
accurate, some might say. If we only show an extension in compat
profiles because core profiles have the functionality guaranteed, they
will return false. Fix these to either check for a core profile
explicitly, or to a different-but-identical extension available in core
profile.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Matteo Bruni <matteo.mystral@gmail.com>
Tested-by: Matteo Bruni <matteo.mystral@gmail.com>
Cc: mesa-stable@lists.freedesktop.org