Reduce code size for Twofish key-setup and remove key dependend branch
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Reduce code size for Twofish key-setup and remove key dependend branch

* cipher/twofish.c (poly_to_exp): Increase size by one, change type
from byte to u16 and insert '492' to index 0.
(exp_to_poly): Increase size by 256, let new cells have zero value.
(CALC_S): Execute unconditionally with help of modified tables.
(do_twofish_setkey): Change type for 'tmp' to 'unsigned int'; Un-unroll
CALC_K256 and CALC_K phases to reduce generated object size.