go/internal/gcimporter: add missing test files

This test files weren't copied by merge.sh.  The test just checks each
file in the directory so it didn't notice that some were missing.

Change-Id: I0d901ac2cdac3df5a7082a12c40d63da3317b7ad
Reviewed-on: https://go-review.googlesource.com/87236
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2 files changed