test: fix child-process-fork-regr-gh-2847 again

Windows is still sometimes failing with ECONNRESET. Bring back the
handling of this error as was initially introduced in PR #4442.

PR-URL: https://github.com/nodejs/node/pull/5179


Reviewed-By: Rich Trott <rtrott@gmail.com>
Fixes: https://github.com/nodejs/node/issues/3635