Correct dbmmanage pwfile check behavior to ignore [:grp...] contents.
  Also add SDBM_File for -lsdbm.

PR:             4695
Submitted by:	arnez@raleigh.ibm.com
Reviewed by:	wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86264 13f79535-47bb-0310-9956-ffa450edef68