Merge pull request #8201 from lioncash/guard

General: Add missing header guards

Source/Core/Common/GL/GLExtensions/GLExtensions.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <string>
 
 #include "Common/CommonTypes.h"

Source/Core/Common/VariantUtil.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <variant>
 
 namespace detail

Source/Core/Core/HW/EXI/BBA-TAP/TAP_Win32.h

@@ -31,6 +31,8 @@
 // the TAP-Win32 driver and contains definitions
 // common to both.
 //===============================================
+#pragma once
+
 #include <windows.h>
 #include <stdlib.h>
 #include <winioctl.h>

Source/Core/UICommon/CommandLineParse.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <memory>
 #include <string>
 #include <vector>