Silence 'make -s distclean'.

* Makefile.in
  (fast-clean): Don't print directory names as we go through them.  Perhaps
    this was necessary in 2001 when this code was added (r839402) to show
    we are not stalled, but the reason no longer holds today, and this reduces
    the noise in 'make -s'.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1479321 13f79535-47bb-0310-9956-ffa450edef68