tdf#143148 Use pragma once instead of include guards

Change-Id: Iddda2d30dce37fd90ce8c1834666f2baf8bd7fb3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/148116
Tested-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>

i18npool/source/localedata/LocaleNode.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_I18NPOOL_SOURCE_LOCALEDATA_LOCALENODE_HXX
-#define INCLUDED_I18NPOOL_SOURCE_LOCALEDATA_LOCALENODE_HXX
+#pragma once
 
 #include <string>
 #include <string_view>
@@ -221,6 +220,4 @@ public:
     virtual void generateCode (const OFileWriter &of) const override;
 };
 
-#endif
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */