crypto: update go.mod for s390x x/sys/cpu changes
To fix broken builds like: https://build.golang.org/log/4c3d8463f5c2b2478dc2315f6c685b2f77bfcdd1 Change-Id: I4c4866e5928a73856ca8a411ed97588e6f66e490 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/170623 Reviewed-by: Michael Munday <mike.munday@ibm.com> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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