tdf#124176 Use pragma once instead of include guards

Change-Id: I778393686b9a51df6437c61a814e5c62a34302de
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113433
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

basegfx/source/workbench/gauss.hxx

@@ -39,8 +39,7 @@
     @return true, if elimination succeeded.
  */
 
-#ifndef INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
-#define INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
+#pragma once
 
 template <class Matrix, typename BaseType>
 bool eliminate(     Matrix&         matrix,
@@ -165,6 +164,4 @@ bool solve( Matrix&     matrix,
     return false;
 }
 
-#endif // INCLUDED_BASEGFX_SOURCE_WORKBENCH_GAUSS_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

compilerplugins/clang/plugin.hxx

@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef PLUGIN_H
-#define PLUGIN_H
+#pragma once
 
 #include <clang/AST/ASTContext.h>
 #include <clang/AST/RecursiveASTVisitor.h>
@@ -312,6 +311,4 @@ const Decl* getFunctionDeclContext(ASTContext& context, const Stmt* stmt);
 
 } // namespace
 
-#endif // COMPILEPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

compilerplugins/clang/pluginhandler.hxx

@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef PLUGINHANDLER_H
-#define PLUGINHANDLER_H
+#pragma once
 
 #include <cstddef>
 #include <functional>
@@ -105,6 +104,4 @@ private:
 
 }
 
-#endif // COMPILEPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

compilerplugins/clang/sharedvisitor/dummyplugin.hxx

@@ -9,8 +9,7 @@
  *
  */
 
-#ifndef DUMMYPLUGIN_H
-#define DUMMYPLUGIN_H
+#pragma once
 
 #include "config_clang.h"
 
@@ -77,6 +76,4 @@ public:
 
 } // namespace
 
-#endif // DUMMYPLUGIN_H
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */