v2.9.14: May 02 2022:
  - Security:
 [CVE-2022-29824] Integer overflow in xmlBuf and xmlBuffer
 Fix potential double-free in xmlXPtrStringRangeFunction
 Fix memory leak in xmlFindCharEncodingHandler
 Normalize XPath strings in-place
 Prevent integer-overflow in htmlSkipBlankChars() and xmlSkipBlankChars()
   (David Kilzer)
 Fix leak of xmlElementContent (David Kilzer)

  - Bug fixes:
 Fix parsing of subtracted regex character classes
 Fix recursion check in xinclude.c
 Reset last error in xmlCleanupGlobals
 Fix certain combinations of regex range quantifiers
 Fix range quantifier on subregex

  - Improvements:
 Fix recovery from invalid HTML start tags

  - Build system, portability:
 Define LFS macros before including system headers
 Initialize XPath floating-point globals
 configure: check for icu DEFS (James Hilliard)
 configure.ac: produce tar.xz only (GNOME policy) (David Seifert)
 CMakeLists.txt: Fix LIBXML_VERSION_NUMBER
 Fix build with older Python versions
 Fix --without-valid build

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