Comment 7 for bug 484317

@Kees, I agree.

This patch attached should do just that.

It's a slight modification of another part of the gdm code that disallows the showing of system users in the selection screen. Copied it into the do_accredit stage of the user authorisation, tested and it works as expected.

Just putting it in the debian/patches folder will apply it to the build.

Regards
Iain