FindDirectX.cmake improvement
resolve errors about 'PVOID64': incompatibility under directx headers and windowsSDK (configuration: Windows XP, DirectX 9 SDK with D3DX_SDK_VERSION=9, microsoft sdk 7.0A)
fix error generate by commit e58e39077863b3dc72d5b21f816d49940a66d14e who certainly cause the problem rectified by 6654f41dceb99d4d2dcc3f177ebb7afc755ed797