[m-rev.] --no-line-numbers by default for us

[Zoltan Somogyi]

> > Since it is very rare and gcc echos the line when it does occur,
> > I think we should solve the readability issue for ALL projects by
> > default, by making --line-numbers only emit #line directives around
> > foreign code.
> 
> OK, I will look into doing that.

The attached diff does this. Since there is agreement
on *what* it does, and the *how* is trivial, there is no need
for a review.

Zoltan.

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