srcdir builds

[Arnaud Charlet]

> > I know that building with srcdir=objdir is no longer officially supported,
> 
> It is.  (It is not the recommended way, though.)

OK, I didn't know that. So there is no doubt that the change made is
clearly wrong.

Of course I won't speak about the fact that only safe and
well tested changes should be made on the 3.1 branch, and that this change
cannot possibly qualify as such, but I wonder who authorized this change.

Arno