[PATCH][RFC] Enable LFS support for libcpp and gcc

[Arnaud Charlet]

> Yeah.  OTOH such large PCHs won't work on a 32bit platform anyway, so
> I see this as a sort-of academic problem ;)

Well, mingw now supports also x86-64, so unless ftello is available in
recent mingw version, that is not really an academic problem.

Arno