cmd/compile/internal/gc: add dropped line correction again
The line correction when reporting a missing package clause
was removed before since it wasn't clear that it was needed.
Added it again because of issue 13267.
No explicit test case has been added to test/fixedbugs because
it would require a file that contains a single byte and such a
file doesn't fit the existing test harness. Instead documented
the problematic line in the parser for future reference.
Fixes #13267.
Change-Id: I590fe8f358042aab73acf16c2ed9567872b174f4
Reviewed-on: https://go-review.googlesource.com/16975 Reviewed-by: Chris Manghane <cmang@golang.org>