tdf#124176: Use pragma once instead of include guards

Change-Id: I422ff363d3abf6b722d584ded3a1d8466cec35a7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87511
Tested-by: Jenkins
Reviewed-by: Muhammet Kara <muhammet.kara@collabora.com>
diff --git a/idlc/inc/aststack.hxx b/idlc/inc/aststack.hxx
index b3f4cda6..bf35756 100644
--- a/idlc/inc/aststack.hxx
+++ b/idlc/inc/aststack.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_IDLC_INC_ASTSTACK_HXX
#define INCLUDED_IDLC_INC_ASTSTACK_HXX

#pragma once

#include <sal/types.h>
#include <vector>
@@ -43,6 +43,4 @@
    std::vector<AstScope*>  m_stack;
};

#endif // INCLUDED_IDLC_INC_ASTSTACK_HXX

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