cmd/go/testdata/script: disable build_plugin_reproducible on darwin
It's broken with the latest XCode versions, and is also already disabled
on darwin builders. Disable the test to get go test cmd/go working on
local builds again.
For #64947
Change-Id: I5a4b46cf23cbe887df4903f90b54cd2225f51233
Reviewed-on: https://go-review.googlesource.com/c/go/+/584937 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>