Due to some lunacy in ndbm.h on some platforms, we need to find the right

include directory for db.h if we include ndbm.h.

Submitted by:	Justin Erenkrantz
Reviewed by:	Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90448 13f79535-47bb-0310-9956-ffa450edef68