Merge r1296428 from trunk:

Fix insecure handling of LD_LIBRARY_PATH that could lead to the
current working directory to be searched for DSOs

CVE-2012-0883

Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1298453 13f79535-47bb-0310-9956-ffa450edef68