tdf#143148: Replace include guard #ifndef with #pragma once

Change-Id: I166c263ec46ae0c10dd6edd0a4e1ccac4df7fb1a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/191111
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Jenkins

vbahelper/source/vbahelper/vbacommandbars.hxx

@@ -16,8 +16,8 @@
  *   except in compliance with the License. You may obtain a copy of
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
-#ifndef INCLUDED_VBAHELPER_SOURCE_VBAHELPER_VBACOMMANDBARS_HXX
-#define INCLUDED_VBAHELPER_SOURCE_VBAHELPER_VBACOMMANDBARS_HXX
+
+#pragma once
 
 #include <ooo/vba/XCommandBar.hpp>
 #include <ooo/vba/XCommandBars.hpp>
@@ -50,6 +50,4 @@ public:
     virtual css::uno::Sequence<OUString> getServiceNames() override;
 };
 
-#endif // INCLUDED_VBAHELPER_SOURCE_VBAHELPER_VBACOMMANDBARS_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */