(des_set_key): Use a new const * variable for the parity
procesing, for constness reasons.

Rev: src/nettle/des.c:1.6

weak.

Rev: src/nettle/des.c:1.5

Rev: src/nettle/des.c:1.4
Rev: src/nettle/des.h:1.6

Rev: src/nettle/aes.c:1.3
Rev: src/nettle/aes.h:1.3
Rev: src/nettle/arcfour.c:1.2
Rev: src/nettle/arcfour.h:1.2
Rev: src/nettle/blowfish.h:1.5
Rev: src/nettle/cast128.c:1.2
Rev: src/nettle/cast128.h:1.2
Rev: src/nettle/des.c:1.3
Rev: src/nettle/des.h:1.3
Rev: src/nettle/macros.h:1.3
Rev: src/nettle/md5.c:1.2
Rev: src/nettle/md5.h:1.2
Rev: src/nettle/serpent.h:1.4
Rev: src/nettle/sha1.c:1.3
Rev: src/nettle/sha1.h:1.2
Rev: src/nettle/twofish.c:1.3
Rev: src/nettle/twofish.h:1.3

successful.

Rev: src/nettle/des.c:1.2

Rev: src/nettle/.cvsignore:1.2
Rev: src/nettle/ChangeLog:1.3
Rev: src/nettle/aes.c:1.2
Rev: src/nettle/des.c:1.1
Rev: src/nettle/des.h:1.1
Rev: src/nettle/desCode.h:1.1
Rev: src/nettle/descore.README:1.1
Rev: src/nettle/desdata.c:1.1
Rev: src/nettle/desinfo.h:1.1
Rev: src/nettle/testsuite/.cvsignore:1.2