Merge r1539455 from trunk:

apr_file_dup2() on Windows: Fix debug RTL assertion when attempting to 
_commit(stdout) or _commit(stderr).

Submitted by: Mike Rumph <mike.rumph oracle.com>
Reviewed by trawick, who adjusted the patch to remove the existing _commit(stdin)


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/branches/1.5.x@1539462 13f79535-47bb-0310-9956-ffa450edef68