dirstatemap: drop legacy method on the dirstatemap wrapper
They are no longer in use now that the Rust wrapper version of the Dirstatemap
are back in line with the Python one.
Differential Revision: https://phab.mercurial-scm.org/D11582
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[100]
$ test -d copy
[1]
$ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[100]
$ killdaemons.py