go/internal/gccgoimporter: add missing testfile (fix 1.9 build)

Change-Id: Icba8d6917dcac4b8f541fc11305981539a12924a
Reviewed-on: https://go-review.googlesource.com/36116
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1 file changed