Add a definition so that mod_perl can be built/linked as a
	DSO on AIX.

Submitted by:	Paul Reder <rederpj@raleigh.ibm.com>
Reviewed by:	Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83179 13f79535-47bb-0310-9956-ffa450edef68