Put explicit (void) in function declarations and shuffle keywords in some
declaration to pass -Wextra, should we want to add it to CFLAGS.
No binary change.
Unifdef -U OPENSSL_BUILD_SHLIBCRYPTO, since all it causes under Unix is to
redefine OPENSSL_EXTERN from `extern' to `extern'.
static const char * = "" -> static const char[] = "", to produce shorter code.
No functional change.
Use C99 initializers for the various FOO_METHOD structs. More readable, and
avoid unreadable/unmaintainable constructs like that:

const EVP_PKEY_ASN1_METHOD cmac_asn1_meth =
        {
        EVP_PKEY_CMAC,
        EVP_PKEY_CMAC,
        0,

        "CMAC",
        "OpenSSL CMAC method",

        0,0,0,0,

        0,0,0,

        cmac_size,
        0,
        0,0,0,0,0,0,0,

        cmac_key_free,
        0,
        0,0
        };

ok matthew@ deraadt@
Remove orphaned l2n6 and n2l6 macros.
typo in comment