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/plugins/clangcodemodel/test/clangcodecompletion_test.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef CLANGCODECOMPLETIONTEST_H
-#define CLANGCODECOMPLETIONTEST_H
+#pragma once
 
 #include <QObject>
 
@@ -65,5 +64,3 @@ private slots:
 } // namespace Tests
 } // namespace Internal
 } // namespace ClangCodeModel
-
-#endif // CLANGCODECOMPLETIONTEST_H

src/plugins/clangcodemodel/test/data/myheader.h

@@ -1,2 +1 @@
 int globalFromHeader;
-

src/plugins/clangcodemodel/test/data/qt-widgets-app/mainwindow.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef MAINWINDOW_H
-#define MAINWINDOW_H
+#pragma once
 
 #include <QMainWindow>
 
@@ -43,5 +42,3 @@ public:
 private:
     Ui::MainWindow *ui;
 };
-
-#endif // MAINWINDOW_H