Comment 38 for bug 857153

Created attachment 575724
patch #7

Add a PreInit() function to be called on window creation, that establishes a
D-Bus connection and makes a pending call to determine whether accessibility
is enabled. Have ShouldA11yBeEnabled block on this call if needed. Hopefully
this will reduce start-up time slightly. (In theory we could probably
only enable a11y on a response to the pending call, but this would be much
more of an architectural change, and we would also need to keep in mind that
currently we are still supporting gconf as a callback, so this approach
is a lot simpler.)

Also, call dbus_connection_set_exit_on_disconnect, and fix some nits.