Merge pull request #5245 from lioncash/guard

video_core: Add missing header guards

src/video_core/renderer_opengl/gl_shader_decompiler.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <array>
 #include <functional>
 #include <optional>