Rename "sni" (Siemens Nixdorf Information Systems) to "siemens" which is the

(recently changed) official name.
Switch off DBM_LIB (it's in libc).


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82624 13f79535-47bb-0310-9956-ffa450edef68