[Dillo-dev] PATCH: small improvement to the "can't start dpid daemon" error message

A common cause of the "can't start dpid daemon" error is clicking on a link with a typo'ed HREF that has an invalid URL scheme (eg. 'ttp://' instead of 'http://', to cite the real-life example that prompted this patch). But the error message gives *no* context that would help to diagnose the problem. If it cited the URL scheme it would save a lot of time. (I had to start Firefox before I realised what the problem was!) Here's a patch to do that. Jeremy Henty