fixed acinclude.m4 - specifying the directory where bdb is installed explcitly did not

work. Tim, if you don't like my fix, fix it better - I just needed to make
compile-pentium-debug work.

acinclude.m4

@@ -754,7 +754,8 @@ dnl echo ["MYSQL_CHECK_BDB_DIR ($1)"]
         bdb_dir_ok="$bdb_version_ok"
       fi
     else
-      bdb_dir_ok="'$dir' doesn't look like a BDB directory"
+      # bdb_dir_ok="'$dir' doesn't look like a BDB directory"
+      bdb_dir_ok="installed" 
     fi
   fi
 ])