Change mailing list to vdpau@lists.freedesktop.org

Users should address questions there instead of to xorg@lists.freedesktop.org.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Acked-by: Robert Morell <rmorell@nvidia.com>

configure.ac

 AC_PREREQ(2.60)
 
-AC_INIT(libvdpau, 0.5, [xorg@lists.freedesktop.org], libvdpau)
+AC_INIT(libvdpau, 0.5, [vdpau@lists.freedesktop.org], libvdpau)
 AM_INIT_AUTOMAKE([dist-bzip2 foreign])
 AM_MAINTAINER_MODE