Merge r1332378 from trunk:

If a filename without slashes is specified for LoadFile or
LoadModule and the file cannot be found in the server root directory,
try to use the standard dlopen() search path. 

Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1364603 13f79535-47bb-0310-9956-ffa450edef68