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

Change-Id: I7f98fa855ff521db42bf9b379bfac3d430791ae0
Reviewed-on: https://gerrit.libreoffice.org/48968Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

configmgr/source/winreg.cxx

@@ -11,15 +11,9 @@
 #include <cwchar>
 #include <memory>
 
-#ifdef _MSC_VER
-#pragma warning(push, 1) /* disable warnings within system headers */
-#endif
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <msiquery.h>
-#ifdef _MSC_VER
-#pragma warning(pop)
-#endif
 
 #include <com/sun/star/uno/RuntimeException.hpp>
 #include <com/sun/star/uno/XInterface.hpp>