Always include lib/sdbm in INCLUDES (until somebody that can spell

lbi/aputil teaches the configure to be a little smarter).  This
lets apu_dbm compile, which in turns lets us build httpd again.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87089 13f79535-47bb-0310-9956-ffa450edef68