Don't break 'make install-tools' if TOOLSDIR is same as BINDIR.

* Makefile.in
  (INSTALL_EXTRA_TOOLS): Check that target and link_name are not the
    same before creating symlink to svnmucc in BINDIR.

Patch by: Alexander Thomas <alexander{_AT_}collab.net>


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1446686 13f79535-47bb-0310-9956-ffa450edef68