mesa/formatquery: Added a func to check if the <target> is supported

mesa/formatquery: Added a func to check if the <target> is supported

From the ARB_internalformat_query2 spec:

  "If the particular <target> and <internalformat> combination do not make
   sense, or if a particular type of <target> is not supported by the
   implementation the "unsupported" answer should be given. This is not an
   error."

This function checks if the <target> is supported by the implementation.

v2: Allow RENDERBUFFER targets also on GLES 3 profiles.

Reviewed-by: Dave Airlie <airlied@redhat.com>