Replace include guards with pragma once

include/PSX/Overlay/overlay.hpp

@@ -1,5 +1,4 @@
-#ifndef __JABYENGINE_OVERLAY__HPP__
-#define __JABYENGINE_OVERLAY__HPP__
+#pragma once
 #include "../AutoLBA/auto_lba.hpp"
 
 namespace JabyEngine {
@@ -7,5 +6,4 @@ namespace JabyEngine {
 
     // Can be used to create dummy values to trick LZ4 into compressing an uncompressed overlay
     #define __create_dummy_fill(length) static const uint8_t __section(".keep.dummy") __used DummyFilling[length] = {0x0}
-}
-#endif //!__JABYENGINE_OVERLAY__HPP__
+}