Make SHA1 optional, implement SHA256 fingerprints SHA256 is always compiled and only enable SHA1 when needed. Fingerprints are always SHA256: base64 format, md5 and sha1 are removed. dbrandom now uses sha256 its hash function.

#include "tommath_private.h"
#ifdef BN_MP_INIT_U64_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

MP_INIT_INT(mp_init_u64, mp_set_u64, uint64_t)
#endif