[dunecontrol] Remove code to handle deprecated dune symlink.

The dune symlink was deprecated since 2009.

bin/dunecontrol

@@ -536,11 +536,6 @@ run_default_vcsetup() {
 }
 
 run_default_update () {
-  DUNELINK=0
-  if test -L dune; then
-    rm dune
-    DUNELINK=1
-  fi
   if test -d .svn; then
     svn update
   elif test -d CVS; then
@@ -566,10 +561,6 @@ run_default_update () {
     echo "WARNING: $module is not under a known version control system."
     echo "         We support svn, git and cvs."
   fi
-  if test "$DUNELINK" != 0 && ! test -d dune; then
-    echo "WARNING: $module is using the deprecated dune symlink"
-    ln -s . dune
-  fi
 }
 
 run_default_autogen () {