xdm of xorg7.2 + pam_ssh doesn't set SSH_AUTH_SOCK

[Yoshihiko Sarumaru]

Just in case you are using xdm with pam_ssh,
recent xdm does not set SSH_AUTH_SOCK, because pam_getenvlist() will not called.

I posted this problem at freedesktop Bugzilla.
You can see details and my patch at:
https://bugs.freedesktop.org/show_bug.cgi?id=11020