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/libs/sqlite/sqlstatementbuilderexception.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef SQLSTATEMENTBUILDEREXCEPTION_H
-#define SQLSTATEMENTBUILDEREXCEPTION_H
+#pragma once
 
 #include "sqliteexception.h"
 
@@ -33,5 +32,3 @@ class SQLITE_EXPORT SqlStatementBuilderException : public SqliteException
 public:
     SqlStatementBuilderException(const char *whatErrorHasHappen, const char *errorMessage = 0);
 };
-
-#endif // SQLSTATEMENTBUILDEREXCEPTION_H