fixup! feat(mingw): Add D3DX8 elimination compatibility layer (TheSuperHackers#2176)

Remove const from m_pData and constructor parameter to eliminate superfluous cast

Author: JohnsterID

Core/Libraries/Include/Lib/D3DXCompat.h

@@ -668,12 +668,12 @@ struct ID3DXBuffer
 class D3DXShaderBuffer : public ID3DXBuffer
 {
 private:
-	const DWORD* m_pData;
+	DWORD* m_pData;
 	DWORD m_Size;
 	mutable LONG m_RefCount;
 
 public:
-	D3DXShaderBuffer(const DWORD* pData, DWORD size) 
+	D3DXShaderBuffer(DWORD* pData, DWORD size) 
 	    : m_pData(pData), m_Size(size), m_RefCount(1) {}
 
 	virtual ~D3DXShaderBuffer() {}
@@ -703,7 +703,7 @@ class D3DXShaderBuffer : public ID3DXBuffer
 	// ID3DXBuffer methods
 	virtual void* __stdcall GetBufferPointer()
 	{
-	    return (void*)m_pData;
+	    return m_pData;
 	}
 
 	virtual DWORD __stdcall GetBufferSize()