test-mq-symlinks: skip if symlinks are not supported

tests/test-mq-symlinks

@@ -1,23 +1,25 b''
 #!/bin/sh
 
+"$TESTDIR/hghave" symlink || exit 80
+
 echo "[extensions]" >> $HGRCPATH
 echo "mq=" >> $HGRCPATH
 
 hg init
 hg qinit
 hg qnew base.patch
 echo a > a
 echo b > b
 hg add a b
 hg qrefresh
 $TESTDIR/readlink.py a
 
 hg qnew symlink.patch
 rm a
 ln -s b a
 hg qrefresh --git
 $TESTDIR/readlink.py a
 
 hg qpop
 hg qpush
 $TESTDIR/readlink.py a