* camellia.c: Rewrote to use 64-bit type for subkeys and use

64-bit operations throughout. Performance on x86_32, when compiled
with gcc-4.4.4, is reduced by roughly 15%, this should be fixed
later.

* camellia.h (struct camellia_ctx): Use type uint64_t for subkeys.

Rev: nettle/ChangeLog:1.93
Rev: nettle/camellia.c:1.3
Rev: nettle/camellia.h:1.3