If ever the gobind tool switches to a source importer (see CL 99777), make sure import paths are without trailing slashes are handled correctly. Change-Id: Ib3ce15f8dcd53dce09a5bb183e4013a5deba39b4 Reviewed-on: https://go-review.googlesource.com/99776 Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>