expat: Fix CVE-2022-43680 for expat

Add a patch to fix CVE-2022-43680 issue where use-after free caused by
overeager destruction of a shared DTD in XML_ExternalEntityParserCreate
in out-of-memory situations
Link: https://nvd.nist.gov/vuln/detail/CVE-2022-43680



Signed-off-by: Ranjitsinh Rathod <ranjitsinh.rathod@kpit.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>