Handle SYSTEM_LIBXML_FOR_BUILD, should fix cross-compilation

Change-Id: Ideba1e359c1e199dcf40fa22f6d520ba9e20dd11

configure.ac

@@ -4716,9 +4716,9 @@ if test "$cross_compiling" = "yes"; then
     mv config.log ../config.Build.log
     mkdir -p ../config_build
     mv config_host/*.h ../config_build
-    . ./bin/get_config_variables CC CXX INSTDIR INSTROOT LIBO_BIN_FOLDER LIBO_LIB_FOLDER LIBO_URE_LIB_FOLDER OS PATH SDKDIRNAME SYSTEM_LIBXSLT WORKDIR
+    . ./bin/get_config_variables CC CXX INSTDIR INSTROOT LIBO_BIN_FOLDER LIBO_LIB_FOLDER LIBO_URE_LIB_FOLDER OS PATH SDKDIRNAME SYSTEM_LIBXML SYSTEM_LIBXSLT WORKDIR
 
-    for V in CC CXX LIBO_BIN_FOLDER LIBO_LIB_FOLDER LIBO_URE_LIB_FOLDER OS SDKDIRNAME SYSTEM_LIBXSLT; do
+    for V in CC CXX LIBO_BIN_FOLDER LIBO_LIB_FOLDER LIBO_URE_LIB_FOLDER OS SDKDIRNAME SYSTEM_LIBXML SYSTEM_LIBXSLT; do
         VV='$'$V
         VV=`eval "echo $VV"`
         if test -n "$VV"; then