testmain.exp: link against GOLIBS Patch by Maciej W. Rozycki. Change-Id: I373d19bbcc0d160065e1453d613c0473a5adb0f9 Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/207458 Reviewed-by: Ian Lance Taylor <iant@golang.org>