tdf#143148 use pragma once instead of include guards

Change-Id: I8ace16d16c900b6cec8fa454250dcdb1698c0677
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175890
Tested-by: Jenkins
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>

sw/inc/chpfld.hxx

@@ -16,8 +16,7 @@
  *   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_SW_INC_CHPFLD_HXX
-#define INCLUDED_SW_INC_CHPFLD_HXX
+#pragma once
 
 #include "fldbas.hxx"
 
@@ -85,6 +84,4 @@ public:
     virtual bool         PutValue( const css::uno::Any& rVal, sal_uInt16 nWhich ) override;
 };
 
-#endif // INCLUDED_SW_INC_CHPFLD_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */