rijndael: fix wrong ifdef for SSSE3 setkey
* cipher/rijndael.c (do_setkey): Use USE_SSSE3 instead of USE_AESNI around SSSE3 setkey selection.
- Reported-by: Richard H Lee <ricardohenrylee@gmail.com>
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>