Add an option to disable ndbm, from Stefan Metzmacher <metze@samba.org>

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15362 ec53bebd-3082-4978-b11e-865c3cabbd6b

cf/db.m4

@@ -8,6 +8,11 @@ AC_ARG_ENABLE(berkeley-db,
                                       [if you don't want berkeley db]),[
 ])
 
+AC_ARG_ENABLE(ndbm-db,
+                       AS_HELP_STRING([--disable-ndbm-db],
+                                      [if you don't want ndbm db]),[
+])
+
 have_ndbm=no
 db_type=unknown
 
@@ -95,6 +100,8 @@ dnl test for ndbm compatability
 
 fi # berkeley db
 
+if test "$enable_ndbm_db" != "no"; then
+
   if test "$db_type" = "unknown" -o "$ac_cv_func_dbm_firstkey" = ""; then
 
     AC_CHECK_HEADERS([				\
@@ -153,7 +160,7 @@ if test "$db_type" = "unknown" -o "$ac_cv_func_dbm_firstkey" = ""; then
         fi
       fi
     fi
-
+  fi #enable_ndbm_db
 fi # unknown
 
 if test "$have_ndbm" = "yes"; then