Interpreter: Remove unnecessary prototypes and includes

Source/Core/Core/PowerPC/Interpreter/Interpreter_FloatingPoint.cpp

@@ -5,18 +5,12 @@
 #include <cmath>
 #include <limits>
 
-#ifdef _WIN32
-#include <intrin.h>
-#endif
-
 #include "Common/MathUtil.h"
 #include "Core/PowerPC/Interpreter/Interpreter.h"
 #include "Core/PowerPC/Interpreter/Interpreter_FPUtils.h"
 
 using namespace MathUtil;
 
-void UpdateSSEState();
-
 // Extremely rare - actually, never seen.
 // Star Wars : Rogue Leader spams that at some point :|
 void Interpreter::Helper_UpdateCR1()

Source/Core/Core/PowerPC/Interpreter/Interpreter_SystemRegisters.cpp

@@ -2,10 +2,6 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
-#ifdef _WIN32
-#include <intrin.h>
-#endif
-
 #include "Common/CPUDetect.h"
 #include "Common/FPURoundMode.h"
 #include "Core/HW/GPFifo.h"