go/gcimporter: exclude failing test from gcimporter tests (fix build)

This is already tested in the std library. Ok to take the easy way
out here.

Change-Id: Ie17e16fddba827bfe279e1f790006b3874f830ad
Reviewed-on: https://go-review.googlesource.com/38455
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
1 file changed