PR 118286 points out that some libgo tests are starting to fail
because they use test certificates that expired on January 1. This
libgo patch is a backport of
https://go.dev/cl/640237 in the main
repo. It uses the existing config.Time field to avoid these test
failures. Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.
Committed to mainline.
Ian