Ignore pax_global_header that some tar versions write as a file.
--- a/tests/test-subrepo-git.t Mon Jan 24 23:25:46 2011 +0100
+++ b/tests/test-subrepo-git.t Tue Jan 25 16:33:46 2011 -0800
@@ -301,6 +301,6 @@
nested archive
$ hg archive --subrepos ../narchive
- $ ls ../narchive/inner/s
+ $ ls ../narchive/inner/s | grep -v pax_global_header
f
g