libbb/sha1: add config-selectable fully unrolled version, closes 14391

function                                             old     new   delta
sha1_process_block64                                 364    4167   +3803
static.rconsts                                        16       -     -16
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(add/remove: 0/1 grow/shrink: 1/0 up/down: 3803/-16)         Total: 3787 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2 files changed