tdf#143148: Use pragma once instead of include guards

- Convert include guards to #pragma once in salhelper, starmath, tools, ucb, and o3tl.
- Kept changes minimal to a small cross-module batch as requested by the easyHack guidance.
- Verified with: container=1 make -j4 o3tl.build salhelper.build starmath.build tools.build ucb.build

Change-Id: Ic047061433985e12be41bdb6463ac4c8e8969ddd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/204555
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Jenkins

o3tl/qa/cow_wrapper_clients.hxx

@@ -17,8 +17,7 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#ifndef INCLUDED_O3TL_QA_COW_WRAPPER_CLIENTS_HXX
-#define INCLUDED_O3TL_QA_COW_WRAPPER_CLIENTS_HXX
+#pragma once
 
 #include <sal/types.h>
 #include <o3tl/cow_wrapper.hxx>
@@ -207,6 +206,4 @@ inline std::basic_ostream<charT, traits> & operator <<(
 
 } // namespace o3tltests
 
-#endif // INCLUDED_O3TL_QA_COW_WRAPPER_CLIENTS_HXX
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

salhelper/test/Symbols/samplelib.hxx

@@ -17,8 +17,7 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#ifndef INCLUDED_SALHELPER_TEST_SYMBOLS_SAMPLELIB_HXX
-#define INCLUDED_SALHELPER_TEST_SYMBOLS_SAMPLELIB_HXX
+#pragma once
 
 #include <sal/types.h>
 
@@ -35,6 +34,4 @@ typedef SampleLib_Api* (*InitSampleLib_Api)(void);
 sal_Int32 funcA(sal_Int32 a);
 double funcB(double a);
 
-#endif
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

starmath/qa/cppunit/mock-visitor.hxx

@@ -7,8 +7,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#ifndef INCLUDED_STARMATH_QA_CPPUNIT_MOCK_VISITOR_HXX
-#define INCLUDED_STARMATH_QA_CPPUNIT_MOCK_VISITOR_HXX
+#pragma once
 
 #include <cppunit/TestAssert.h>
 #include <visitors.hxx>
@@ -187,6 +186,4 @@ private:
     }
 };
 
-#endif
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

tools/qa/cppunit/test_cpu_runtime_detection_x86_checks.hxx

@@ -7,8 +7,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#ifndef INCLUDE_TOOLS_QA_CPPUNIT_TEST_CPU_RUNTIME_DETECTION_X86_CHECKS_H
-#define INCLUDE_TOOLS_QA_CPPUNIT_TEST_CPU_RUNTIME_DETECTION_X86_CHECKS_H
+#pragma once
 
 class CpuRuntimeDetectionX86Checks
 {
@@ -18,6 +17,4 @@ public:
     static void checkSSSE3();
 };
 
-#endif
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

ucb/source/ucp/webdav-curl/PropfindCache.hxx

@@ -7,8 +7,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-#ifndef INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_PROPFINDCACHE_HXX
-#define INCLUDED_UCB_SOURCE_UCP_WEBDAV_NEON_PROPFINDCACHE_HXX
+#pragma once
 
 #include <sal/types.h>
 #include <rtl/ustring.hxx>
@@ -75,6 +74,4 @@ namespace http_dav_ucp
 
 }
 
-#endif
-
 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */