egl: QueryContext on a configless context returns zero
egl: QueryContext on a configless context returns zero

MESA_configless_context does not specify the interaction with
QueryContext at all, and the code to generate an error in this case
predates the Mesa extension. Since EGL_NO_CONFIG_{KHR,MESA} are
numerically identical there's no way to distinguish which one the
application asked for, so use the KHR behaviour.

Reviewed-by: Kristian Høgsberg <ca9b5b1e27d4fa7f4ba6848bdd08ca52cfd6330c@bitplanet.net>
Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>
Signed-off-by: Adam Jackson <4482611cc290c2ce1399431891dcb9221c95f994@redhat.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler