general: Add missing #pragma once directives

src/common/logging/types.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <chrono>
 
 #include "common/common_types.h"

src/core/hle/api_version.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include "common/common_types.h"
 
 // This file contains yuzu's HLE API version constants.

src/core/hle/service/spl/spl_results.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include "core/hle/result.h"
 
 namespace Service::SPL {

src/core/hle/service/spl/spl_types.h

@@ -2,6 +2,8 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#pragma once
+
 #include <span>
 
 #include "common/bit_field.h"