cmd/cgo/internal/test: don't skip some tests on musl
They reportedly work at least as of Alpine 3.18.
Fixes #39857
Change-Id: I6a249d61d33e467bf32e8c250f870fc261b90941
Reviewed-on: https://go-review.googlesource.com/c/go/+/563096
Auto-Submit: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Austin Clements <austin@google.com>