Split diagnostic about blank lines in input

[Alejandro Colomar]

Hi Branden,

I've got some wish, which ISTR I already expressed at some point in the
past.  There's this diagnostic:

an.tmac:man3/nxt_unit_init.3:62: style: blank line in input

The thing is, for example C programs I do need to violate that.  But,
other than that, I want to see the diagnostic, if someone used it
outside of an example.

How about splitting this diagnostic, making two different diagnostics?

        style: blank line in input out of a EX/EE region
        style: blank line in input in a EX/EE region

I would be able to grep out the second warning.

Cheers,
Alex

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