make windows as unsupported

Author: vbvictor

clang/test/AST/ast_matchers_updated.test

@@ -1,2 +1,4 @@
+// FIXME enable windows
+// UNSUPPORTED: system-windows
 // RUN: %python %S/../../docs/tools/dump_ast_matchers.py %t
 // RUN: diff %t %S/../../docs/LibASTMatchersReference.html