If we don't use xmlconfig, expat becomes an optional dependency on
Linux/BSD, which may be convenient for embedded systems that do not
otherwise need expat. (expat is so ubiquitous that this
probably doesn't matter a ton in practice, but fewer required Mesa deps
is probably nice anyway.)
Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Suggested-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19626>
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