[utils/build-parser-lib] Set DLLVM_ENABLE_LIBXML2=FALSE for parser library build

This is not necessary and causes CMake error in certain builds

Author: akyrtzi

utils/build-parser-lib

@@ -121,6 +121,7 @@ class Builder(object):
         cmake_args += ['-DSWIFT_BUILD_REMOTE_MIRROR=FALSE', '-DSWIFT_BUILD_DYNAMIC_STDLIB=FALSE',
             '-DSWIFT_BUILD_STATIC_STDLIB=FALSE', '-DSWIFT_BUILD_DYNAMIC_SDK_OVERLAY=FALSE',
             '-DSWIFT_BUILD_STATIC_SDK_OVERLAY=FALSE']
+        cmake_args += ['-DLLVM_ENABLE_LIBXML2=FALSE']
         # We are not using cmark but initialize the CMARK variables to something so that configure can succeed.
         cmake_args += ['-DCMARK_MAIN_INCLUDE_DIR='+os.path.join(SWIFT_SOURCE_ROOT, 'cmark'), '-DCMARK_BUILD_INCLUDE_DIR='+os.path.join(self.build_dir, 'cmark')]
         cmake_args += ['-DLLVM_INCLUDE_TESTS=FALSE', '-DCLANG_INCLUDE_TESTS=FALSE', '-DSWIFT_INCLUDE_TESTS=FALSE']