caching if a signal has a connection

[ERDI Gergo <cactus cactus rulez org>]

Hi,

I was recently advised to check if a signal has any connection before
emitting it since this signal would be emitted quite frequently and it
would be a big overhead, so I used gtk_signal_handler_pending. However, it
occured to me that gtk_signal_emit_real should not take longer if there's
no handler function than checking it via gtk_signal_handler_pending, and
thinking more about it, I think since a lot of signals are emitted that
have no handlers, caching if gtk_emit_real should return immediatly could
be quite a performance boost if signal emission is really an
overhead currently.

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