Wholesale conversion to #pragma once

Kudos to cgmb and https://github.com/cgmb/guardonce

Change-Id: Ifa8970734b8d43fd08c9260c645bdb0228633791
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/tools/clangbackend/ipcsource/cursor.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef CLANGBACKEND_CURSOR_H
-#define CLANGBACKEND_CURSOR_H
+#pragma once
 
 #include "clangtype.h"
 
@@ -119,6 +118,3 @@ bool operator==(const Cursor &first, const Cursor &second);
 void PrintTo(CXCursorKind cursorKind, ::std::ostream *os);
 void PrintTo(const Cursor &cursor, ::std::ostream* os);
 } // namespace ClangBackEnd
-
-
-#endif // CLANGBACKEND_CURSOR_H