[ConsoleKit] [Patch] console-kit-daemon restart when receiving SIGPOLL on Solaris

[Halton Huo]

Hi,

This is Solaris specific patch, won't affect other platform, I'd like to
check in to master.

console-kit-daemon will receive SIGPOLL when VT is switched, this will
cause c-k-d exit. It is because the process does not go into
handle_vt_active() as we wish.

We found that using signal() rather than sigaction() fix this issue.
        
Refer to bug http://defect.opensolaris.org/bz/show_bug.cgi?id=11612 for
more information.

Thanks,
Halton.
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