go/internal/gccgoimporter: use 0 not io.SeekStart for Go 1.6 compatibility.

Change-Id: I396e221217c7fac5e7a9d66cbd97ef51782b0dd8
Reviewed-on: https://go-review.googlesource.com/32298
Reviewed-by: Robert Griesemer <gri@golang.org>
1 file changed