Deal gracefully with unexpected accept() and select() errors in the

child_main() loop.  This was built based on data from a bunch of PRs,
and data from the new-httpd archives, nh.9603 and nh.9701 in particular.

I've actually been running with the extra errno tests for linux for
the past 6 or 7 months.  Without them there is a LOT of spam in the
error log on a linux box, compared to none on a solaris box on the
same segment.

PR:             1747, 1107, 588, 1787


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80209 13f79535-47bb-0310-9956-ffa450edef68