temporarily split x86 GCC flags for 32- vs. 64-bit
temporarily split x86 GCC flags for 32- vs. 64-bit

mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4,8l/rsp,8l/rsp,8l/rsp