cmd/link: disable flaky Darwin "symbols" test
cmd/link: disable flaky Darwin "symbols" test

About one run out of 3 it fails on my laptop, and
I am tired of having to be a nanny for my tests just
because of this one flaky test.  This has been a problem
for months.

Updates #32218.

Change-Id: I2871d4c6f47e9432d189ed7bdcda8f9c0871cfc5
Reviewed-on: https://go-review.googlesource.com/c/go/+/297469
Trust: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>
Run-TryBot: David Chase <ae171625adc8645b8b79b7e405a6da5aba5341e0@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

cloudflare/go,cloudflare/go,nawawi/go,golang/go,nawawi/go,nawawi/go,cloudflare/go,CAFxX/go,cloudflare/go,golang/go,CAFxX/go,golang/go,CAFxX/go,golang/go,CAFxX/go,golang/go,CAFxX/go,nawawi/go,nawawi/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,CAFxX/go,cloudflare/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,cloudflare/go,golang/go,golang/go