Upgrade paxutils to d50ea31268

This fixes two bugs related to remote archives:

1. Access from unprivileged user accounts.
2. Malfunctioning seek (L) command.

diff --git a/paxutils b/paxutils
index 9ad2a83e9c8de70d83dbe956c144be51f66a9abb..d50ea31268250eea8166d62326deb4386cb65cf9 160000 (submodule)
--- a/paxutils
+++ b/paxutils
@@ -1 +1 @@
-Subproject commit 9ad2a83e9c8de70d83dbe956c144be51f66a9abb
+Subproject commit d50ea31268250eea8166d62326deb4386cb65cf9