Support openssl optimized 32bit RC4 key packing
    
    Openssl detects at runtime the CPU type and on some 32 bit CPUs will
    automatically switch to a compressed schedule for the RC4_KEY.
    Don't try to be too smart nd just copy all the data even if it takes
    4 times the space.
    
    The code still assumes sizeof(RC4_INT) == sizeof(uint32_t)