cmd/link: accept Windows line-ending in TestTrampolineCgo
cmd/link: accept Windows line-ending in TestTrampolineCgo

Apparently C printf emits "\r\n" on Windows. Accept that.

Change-Id: If87ba41435e3147d3892cfc3fe3a105b066ff0aa
Reviewed-on: https://go-review.googlesource.com/c/go/+/322973
Trust: Cherry Mui <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
Run-TryBot: Cherry Mui <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Than McIntosh <4b2922593166fc595a9b1a408f34f5d3817fe9d2@google.com>

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