Roll libxml to 2.9.3

third_party/libxml/src/configure.ac

 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.63])
 AC_INIT
 AC_CONFIG_SRCDIR([entities.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_HOST
 
 LIBXML_MAJOR_VERSION=2
 LIBXML_MINOR_VERSION=9
-LIBXML_MICRO_VERSION=2
+LIBXML_MICRO_VERSION=3
 LIBXML_MICRO_VERSION_SUFFIX=
 LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION$LIBXML_MICRO_VERSION_SUFFIX
 LIBXML_VERSION_INFO=`expr $LIBXML_MAJOR_VERSION + $LIBXML_MINOR_VERSION`:$LIBXML_MICRO_VERSION:$LIBXML_MINOR_VERSION
 
 LIBXML_VERSION_NUMBER=`expr $LIBXML_MAJOR_VERSION \* 10000 + $LIBXML_MINOR_VERSION \* 100 + $LIBXML_MICRO_VERSION`
 
 if test -f CVS/Entries ; then
   extra=`grep ChangeLog CVS/Entries | grep -v LIBXML | sed -e s\%/ChangeLog/1\.%% -e s\%/.*$%%`
   echo extra=$extra
   if test "$extra" != ""
@@ skipping 416 matching lines @@
             AC_CHECK_LIB(lzma, lzma_code,[
                 have_liblzma=yes
                 if test "x${LZMA_DIR}" != "x"; then
                     LZMA_CFLAGS="-I${LZMA_DIR}/include"
                     LZMA_LIBS="-L${LZMA_DIR}/lib -llzma"
                 else
                     LZMA_LIBS="-llzma"
                 fi],
                 [have_liblzma=no])
              LDFLAGS="${SAVE_LDFLAGS}"])
+    else
+        # we still need to check for lzma,h header
+        AC_CHECK_HEADERS([lzma.h])
     fi
 
     # Found the library via either method?
     if test "x$have_liblzma" = "xyes"; then
         AC_DEFINE([HAVE_LIBLZMA], [1], [Have compression library])
         WITH_LZMA=1
     fi
 fi
 
 AC_SUBST(LZMA_CFLAGS)
@@ skipping 1197 matching lines @@
 rm -f COPYING.LIB COPYING
 ln -s $srcdir/Copyright COPYING
 
 # keep on one line for cygwin c.f. #130896
 AC_CONFIG_FILES([libxml2.spec:libxml.spec.in Makefile include/Makefile include/libxml/Makefile doc/Makefile doc/examples/Makefile doc/devhelp/Makefile example/Makefile python/Makefile python/tests/Makefile xstc/Makefile include/libxml/xmlversion.h libxml-2.0.pc libxml-2.0-uninstalled.pc libxml2-config.cmake])
 AC_CONFIG_FILES([python/setup.py], [chmod +x python/setup.py])
 AC_CONFIG_FILES([xml2-config], [chmod +x xml2-config])
 AC_OUTPUT
 
 echo Done configuring