Upgrade to libxml 2.9.2 and libxslt 1.1.28

third_party/libxml/src/acinclude.m4

Index: third_party/libxml/src/acinclude.m4
diff --git a/third_party/libxml/src/acinclude.m4 b/third_party/libxml/src/acinclude.m4
index 4ff672e154bc518caee68db068f2409847f721f6..7ad8630a4f03e00baa5ed8f30f80b8b595504738 100644
--- a/third_party/libxml/src/acinclude.m4
+++ b/third_party/libxml/src/acinclude.m4
@@ -2,8 +2,8 @@ dnl Like AC_TRY_EVAL but also errors out if the compiler generates
 dnl _any_ output. Some compilers might issue warnings which we want
 dnl to catch.
 AC_DEFUN([AC_TRY_EVAL2],
-[{ (eval echo configure:__oline__: \"[$]$1\") 1>&AC_FD_CC; dnl
-(eval [$]$1) 2>&AC_FD_CC; _out=`eval [$]$1 2>&1` && test "x$_out" = x; }])
+[{ (eval echo configure:__oline__: \"[$]$1\") 1>&AS_MESSAGE_LOG_FD; dnl
+(eval [$]$1) 2>&AS_MESSAGE_LOG_FD; _out=`eval [$]$1 2>&1` && test "x$_out" = x; }])
 
 dnl Like AC_TRY_COMPILE but calls AC_TRY_EVAL2 instead of AC_TRY_EVAL
 AC_DEFUN([AC_TRY_COMPILE2],
@@ -19,8 +19,8 @@ if AC_TRY_EVAL2(ac_compile); then
   ifelse([$3], , :, [rm -rf conftest*
   $3])
 else
-  echo "configure: failed program was:" >&AC_FD_CC
-  cat conftest.$ac_ext >&AC_FD_CC
+  echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
+  cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
 ifelse([$4], , , [  rm -rf conftest*
   $4
 ])dnl