Build win release packages with LLDB_ENABLE_LIBXML2 (llvm#170513)

Fixes llvm#170461

Author: zmodem

llvm/utils/release/build_llvm_release.bat

@@ -190,8 +190,7 @@ if "%force-msvc%" == "" (
 
 set common_lldb_flags=^
   -DLLDB_RELOCATABLE_PYTHON=1 ^
-  -DLLDB_EMBED_PYTHON_HOME=OFF ^
-  -DLLDB_ENABLE_LIBXML2=OFF
+  -DLLDB_EMBED_PYTHON_HOME=OFF
 
 set cmake_profile_flags=""
 
@@ -395,7 +394,7 @@ cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=install ^
   -DLIBXML2_WITH_LZMA=OFF -DLIBXML2_WITH_MEM_DEBUG=OFF -DLIBXML2_WITH_MODULES=OFF ^
   -DLIBXML2_WITH_OUTPUT=ON -DLIBXML2_WITH_PATTERN=OFF -DLIBXML2_WITH_PROGRAMS=OFF ^
   -DLIBXML2_WITH_PUSH=OFF -DLIBXML2_WITH_PYTHON=OFF -DLIBXML2_WITH_READER=OFF ^
-  -DLIBXML2_WITH_REGEXPS=OFF -DLIBXML2_WITH_RUN_DEBUG=OFF -DLIBXML2_WITH_SAX1=OFF ^
+  -DLIBXML2_WITH_REGEXPS=OFF -DLIBXML2_WITH_RUN_DEBUG=OFF -DLIBXML2_WITH_SAX1=ON ^
   -DLIBXML2_WITH_SCHEMAS=OFF -DLIBXML2_WITH_SCHEMATRON=OFF -DLIBXML2_WITH_TESTS=OFF ^
   -DLIBXML2_WITH_THREADS=ON -DLIBXML2_WITH_THREAD_ALLOC=OFF -DLIBXML2_WITH_TREE=ON ^
   -DLIBXML2_WITH_VALID=OFF -DLIBXML2_WITH_WRITER=OFF -DLIBXML2_WITH_XINCLUDE=OFF ^