glx: Unbreak generating some of the xorg glx headers

Broken by:

    commit 9ace0b542241c77ae82a0835ac8a09e2a7510eaf
    Author: Dylan Baker <baker.dylan.c@gmail.com>
    Date:   Wed May 20 15:49:11 2015 -0700

	glapi: glX_proto_size.py: use argparse instead of getopt

Which changed most, but not all, callers to use --header-tag instead of
-h.

Reviewed-by: Dylan Baker <baker.dylan.c@gmail.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
1 file changed