Remove unused macros

[karel-m]

Mentioned in #424

-Wunused-macros

src/ciphers/anubis.c:38:0: warning: macro "MAX_KEYSIZEB" is not used [-Wunused-macros]
 #define MAX_KEYSIZEB    (4*MAX_N)

src/ciphers/anubis.c:39:0: warning: macro "BLOCKSIZE" is not used [-Wunused-macros]
 #define BLOCKSIZE       128

src/ciphers/anubis.c:35:0: warning: macro "MIN_ROUNDS" is not used [-Wunused-macros]
 #define MIN_ROUNDS      (8 + MIN_N)

src/ciphers/anubis.c:40:0: warning: macro "BLOCKSIZEB" is not used [-Wunused-macros]
 #define BLOCKSIZEB      (BLOCKSIZE/8)

src/ciphers/anubis.c:36:0: warning: macro "MAX_ROUNDS" is not used [-Wunused-macros]
 #define MAX_ROUNDS      (8 + MAX_N)

src/ciphers/anubis.c:37:0: warning: macro "MIN_KEYSIZEB" is not used [-Wunused-macros]
 #define MIN_KEYSIZEB    (4*MIN_N)

src/ciphers/anubis.c:33:0: warning: macro "MIN_N" is not used [-Wunused-macros]
 #define MIN_N           4

src/ciphers/khazad.c:33:0: warning: macro "KEYSIZE" is not used [-Wunused-macros]
 #define KEYSIZE      128

src/ciphers/khazad.c:35:0: warning: macro "BLOCKSIZE" is not used [-Wunused-macros]
 #define BLOCKSIZE   64

src/ciphers/khazad.c:36:0: warning: macro "BLOCKSIZEB" is not used [-Wunused-macros]
 #define BLOCKSIZEB   (BLOCKSIZE/8)

src/ciphers/khazad.c:34:0: warning: macro "KEYSIZEB" is not used [-Wunused-macros]
 #define KEYSIZEB   (KEYSIZE/8)

src/ciphers/twofish/twofish.c:40:0: warning: macro "MDS_POLY" is not used [-Wunused-macros]
 #define MDS_POLY          0x169

src/mac/hmac/hmac_test.c:18:0: warning: macro "LTC_HMAC_BLOCKSIZE" is not used [-Wunused-macros]
 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize

src/stream/sober128/sober128_stream.c:24:0: warning: macro "FOLD" is not used [-Wunused-macros]
 #define FOLD                      N /* how many iterations of folding to do */

src/stream/sober128/sober128_stream.c:29:0: warning: macro "B" is not used [-Wunused-macros]
 #define B(x,i) ((unsigned char)(((x) >> (8*i)) & 0xFF))