Changed lingering header include guards to pragma once.

Some headers where using #ifndef to guard being including multiple times. But most were using pragma once. So for consistency I changed them all to use pragma once.

Source/Core/Core/IPC_HLE/fakepoll.h

@@ -15,10 +15,9 @@
 // * don't set POLLIN or POLLOUT in revents if it wasn't requested
 //   in events (only happens when an fd is in the poll set twice)
 
-#if (_WIN32_WINNT < _WIN32_WINNT_VISTA)
+#pragma once
 
-#ifndef _FAKE_POLL_H
-#define _FAKE_POLL_H
+#if (_WIN32_WINNT < _WIN32_WINNT_VISTA)
 
 #include <limits.h>
 #include <sys/types.h>
@@ -158,8 +157,6 @@ inline int poll(struct pollfd *pollSet, int pollCount, int pollTimeout)
 	return result;
 }
 
-#endif
-
 #else // (_WIN32_WINNT < _WIN32_WINNT_VISTA)
 
 typedef pollfd pollfd_t;

Source/Core/Core/PowerPC/Jit64IL/JitIL_Tables.h

@@ -2,8 +2,7 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
-#ifndef JITIL_TABLES_H
-#define JITIL_TABLES_H
+#pragma once
 
 #include "Core/PowerPC/Gekko.h"
 #include "Core/PowerPC/PPCTables.h"
@@ -14,5 +13,3 @@ namespace JitILTables
 	void CompileInstruction(PPCAnalyst::CodeOp & op);
 	void InitTables();
 }
-
-#endif

Source/Core/VideoCommon/VertexLoader_Position.h

@@ -2,8 +2,7 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
-#ifndef VERTEXLOADER_POSITION_H
-#define VERTEXLOADER_POSITION_H
+#pragma once
 
 class VertexLoader_Position {
 public:
@@ -18,4 +17,3 @@ public:
 	static TPipelineFunction GetFunction(unsigned int _type, unsigned int _format, unsigned int _elements);
 };
 
-#endif