Style: Replace header guards with #pragma once

test/src/example.h

@@ -3,8 +3,7 @@
  * This is free and unencumbered software released into the public domain.
  */
 
-#ifndef EXAMPLE_CLASS_H
-#define EXAMPLE_CLASS_H
+#pragma once
 
 // We don't need windows.h in this example plugin but many others do, and it can
 // lead to annoying situations due to the ton of macros it defines.
@@ -289,5 +288,3 @@ protected:
 public:
 	String get_the_word() const;
 };
-
-#endif // EXAMPLE_CLASS_H