crypto/tls: add no-shared to openssl build instructions
This prevents the custom-built version of openssl prefering the system
libraries over the ones compiled with the specified (weak crypto)
options necessary to generate the updates. This difference can lead to
confusing failures when updating the tests.
Fixes #31809
Change-Id: I2dd257f3121d6c6c62c6aeba52e1c74046b3c584
GitHub-Last-Rev:
6d4eeafadf0b4671b7e17c6810f1a66a9fda7d3c
GitHub-Pull-Request: golang/go#41630
Reviewed-on: https://go-review.googlesource.com/c/go/+/257517
Trust: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>