cmd/go: replace TestCgoDependsOnSyscall with a simpler script test
The existing test attempted to remove '_race' binaries from
GOROOT/pkg, which could not only fail if GOROOT is read-only, but also
interfere with other tests run in parallel.
Updates #30316
Updates #37573
Updates #17751
Change-Id: Id7e2286ab67f8333baf4d52244b7f4476aa93a46
Reviewed-on: https://go-review.googlesource.com/c/go/+/223745
Run-TryBot: Bryan C. Mills <bcmills@google.com> Reviewed-by: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>