Change utf-8 copyright characters to '(C)'

cipher/blowfish-amd64.S: Change utf-8 encoded copyright character to
'(C)'.
cipher/blowfish-arm.S: Ditto.
cipher/bufhelp.h: Ditto.
cipher/camellia-aesni-avx-amd64.S: Ditto.
cipher/camellia-aesni-avx2-amd64.S: Ditto.
cipher/camellia-arm.S: Ditto.
cipher/cast5-amd64.S: Ditto.
cipher/cast5-arm.S: Ditto.
cipher/cipher-ccm.c: Ditto.
cipher/cipher-cmac.c: Ditto.
cipher/cipher-gcm.c: Ditto.
cipher/cipher-selftest.c: Ditto.
cipher/cipher-selftest.h: Ditto.
cipher/mac-cmac.c: Ditto.
cipher/mac-gmac.c: Ditto.
cipher/mac-hmac.c: Ditto.
cipher/mac-internal.h: Ditto.
cipher/mac.c: Ditto.
cipher/rijndael-amd64.S: Ditto.
cipher/rijndael-arm.S: Ditto.
cipher/salsa20-amd64.S: Ditto.
cipher/salsa20-armv7-neon.S: Ditto.
cipher/serpent-armv7-neon.S: Ditto.
cipher/serpent-avx2-amd64.S: Ditto.

cipher/serpent-sse2-amd64.S: Ditto.

Avoid use of '©' for easier parsing of source for copyright information.

• Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>