Replace include guards with pragma once

src/Library/internal-include/GPU/gpu_internal.hpp

@@ -1,5 +1,4 @@
-#ifndef __JABYENGINE_GPU_INTERNAL_HPP__
-#define __JABYENGINE_GPU_INTERNAL_HPP__
+#pragma once
 #include <PSX/GPU/gpu.hpp>
 #include <PSX/System/IOPorts/dma_io.hpp>
 #include <PSX/System/IOPorts/gpu_io.hpp>
@@ -100,6 +99,4 @@ namespace JabyEngine {
             }
         }
     }
-}
-
-#endif //!__JABYENGINE_GPU_INTERNAL_HPP__
+}