SHA-1/SSSE3: Improve performance on large buffers
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SHA-1/SSSE3: Improve performance on large buffers

* cipher/sha1-ssse3-amd64.S (RNBLKS): New.
(_gcry_sha1_transform_amd64_ssse3): Handle multiple input blocks, with
software pipelining of next data block processing.
* cipher/sha1.c [USE_SSSE3] (_gcry_sha1_transform_amd64_ssse3): Add
'nblks'.
(transform) [USE_SSSE3]: Pass nblks to assembly function.

Patch gives small improvement for large buffer processing, on Intel i5-4570
speed goes from 4.80 c/B to 4.61 c/B.