[RFA] diagnostic.c: Emphasise preprocessed source for bug reports

[Gabriel Dos Reis]

Neil Booth <neil@daikokuya.demon.co.uk> writes:

| We get a large number of bug reports without preprocessed source.
| There is little point asking people, via "feedback", for preprocessed
| source more than 24 hours after the event -- I don't think anyone has
| ever responded (quite reasonably IMO - they've long since moved on) to
| such a request.  This renders many reports useless, that might
| otherwise be useful.
| 
| So, I'd like to emphasise this more in the diagnostics.  I've checked
| diagnostic.c compiles.  OK to commit this?

Yes.

-- Gaby
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