sha1_block
DEFINE_IFUNC(, void, sha1_block, (SHA1_CTX *, const void *, size_t))
DEFINE_UIFUNC(, void, sha1_block, (SHA1_CTX *, const void *, size_t))
#ifndef sha1_block
sha1_block(c, p, n);
extern void sha1_block(SHA1_CTX *, const void *, size_t);
static void sha1_block(SHA1_CTX *, const void *, size_t);
sha1_block(c, (void *)c->data, SHA_CBLOCK);