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[S390x] Optimize Chacha20 with fat build support

Maamoun TKrequested to merge
mamonet/nettle:s390x-chacha into master

This patch optimizes Chacha20 for s390x architecture by following the approach used in powerpc implementation.

testsuite passes all tests of this patch.

Benchmark of chacha encrypt/decrypt using nettle-benchmark on z15

C This patch
384.13 Mbyte/s 1478.10 Mbyte/s

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