Merge r1527008 from trunk:

Fix the null device name on Windows so that stderr can be sent
to the bit bucket.  (This logic is always hit when using an error
log provider.)

Submitted by: trawick
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1530279 13f79535-47bb-0310-9956-ffa450edef68