time: skip TestLongAdjustTimers on plan9 (too slow)
The TestLongAdjustTimers test has been consistently timing out
after 60 seconds on plan9-arm. Skip the test for plan9, as it
is already skipped for being too slow on android and ios.
Fixes #74921
Change-Id: Icc32e902cecd2e98971a898373fe8346b179437d
Reviewed-on: https://go-review.googlesource.com/c/go/+/693955 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Mark Freeman <markfreeman@google.com>