Fix building with PCH disabled.

Source/Core/Core/CoreTiming.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <cinttypes>
+#include <mutex>
 #include <string>
 #include <vector>
 

Source/Core/Core/FifoPlayer/FifoPlayer.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <mutex>
 
 #include "Common/CommonTypes.h"
 #include "Core/ConfigManager.h"

Source/Core/Core/FifoPlayer/FifoRecorder.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <algorithm>
+#include <mutex>
 
 #include "Common/Thread.h"
 #include "Core/ConfigManager.h"

Source/Core/Core/GeckoCode.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <vector>
 
 #include "Common/CommonPaths.h"

Source/Core/Core/HW/SI_DeviceGBA.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <queue>
 
 #include "Common/CommonFuncs.h"

Source/Core/Core/HW/SI_GCAdapter.cpp

@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <libusb.h>
+#include <mutex>
 
 #include "Common/Flag.h"
 #include "Common/Thread.h"

Source/Core/Core/Movie.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2+
 // Refer to the license.txt file included.
 
+#include <mutex>
 #include <polarssl/md5.h>
 
 #include "Common/ChunkFile.h"

Source/Core/VideoBackends/Software/SWRenderer.cpp

@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <atomic>
+#include <mutex>
 #include <string>
 
 #include "Common/CommonTypes.h"