tests: 'hghave unix-permissions' for test-import.t
'hg import' of a patch with mode changes requires unix permissions support in
the file system.
--- a/tests/test-import.t Mon Nov 21 00:39:32 2011 +0100
+++ b/tests/test-import.t Mon Nov 21 00:39:32 2011 +0100
@@ -1,3 +1,5 @@
+ $ "$TESTDIR/hghave" unix-permissions || exit 80
+
$ hg init a
$ mkdir a/d1
$ mkdir a/d1/d2