unoxml: MSVC: pragma warning: make more specific, remove obsolete

Change-Id: I6c09eeeb43cd0bf85b89b1332f2ee6121b11de3c
Reviewed-on: https://gerrit.libreoffice.org/49056Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

unoxml/source/dom/saxbuilder.cxx

@@ -16,9 +16,6 @@
  *   except in compliance with the License. You may obtain a copy of
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
-#ifdef _MSC_VER
-#pragma warning(disable : 4701)
-#endif
 
 #include "saxbuilder.hxx"