Back-patch today's memory management fixups in contrib/xml2.
Prior to 8.3, these changes are not critical for compatibility with core
Postgres, since core had no libxml2 calls then. However there is still
a risk if contrib/xml2 is used along with libxml2 functionality in Perl
or other loadable modules. So back-patch to all versions.
Also back-patch addition of regression tests. I'm not sure how many of
the cases are interesting without the interaction with core xml code,
but a silly regression test is still better than none at all.
Makefile (r1.12 -> r184.108.40.206)
xpath.c (r220.127.116.11 -> r18.104.22.168)
xslt_proc.c (r22.214.171.124 -> r126.96.36.199)
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