glapi: Annotate XML with exec="{es,check}" for special GLES1 functions.

glapi: Annotate XML with exec="{es,check}" for special GLES1 functions.

Future patches will use this annotation when code generating
_mesa_create_exec_table(), to determine which functions should be
dispatched to ES-specific implementations.  exec="es" indicates that
the ES-specific implementation has a name beginning with "_es_"
(e.g. _es_QueryMatrixxOES), and exec="check" indicates that the
ES-specific implementation has a name beginning with "_check_"
(e.g. _check_GetTexGenxvOES).

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>