test: only check for issue11362 error with gc

With the gc compiler the import path implies the package path,
so keeping a canonical path is important.  With the gofrontend
this is not the case, so we don't need to report this as a bug.

Change-Id: I245e34f9b66383bd17e79438d4b002a3e20aa994
Reviewed-on: https://go-review.googlesource.com/c/go/+/278115


Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>