fixed [LS]WC2 sign mismatch warning #ifndef ARCH_MIN_SSE2
fixed [LS]WC2 sign mismatch warning #ifndef ARCH_MIN_SSE2

mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4