tests: add missing 'hghave unix-permissions'

tests/test-pull-permission.t

@@ -1,29 +1,31 b''
+  $ "$TESTDIR/hghave" unix-permissions || exit 80
+
   $ hg init a
   $ cd a
   $ echo foo > b
   $ hg add b
   $ hg ci -m "b"
 
   $ chmod -w .hg/store
 
   $ cd ..
 
   $ hg clone a b
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
   $ chmod +w a/.hg/store # let test clean up
 
   $ cd b
   $ hg verify
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   1 files, 1 changesets, 1 total revisions