runtime: consolidate some low-level error reporting
Use a single writeErrStr function. Avoid using global variables.
Use a single version of some error messages rather than duplicating
the messages in OS-specific files.
Change-Id: If259fbe78faf797f0a21337d14472160ca03efa0
Reviewed-on: https://go-review.googlesource.com/c/go/+/447055
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>