RFC: Moving C to its own directory

[Nathanael Nerode]

>> Where does cpplib go in this system?  A toplevel directory alongside 
>gcc?
>
>Yes.  That's currently blocked on (a) finishing Eric Christopher's
>work to get proper charset conversion happening, (b) Nathanael moving
>the bootstrap logic to the top level.  The latter is not strictly
>necessary; it would mean that cpplib only got built with the host
>compiler, but that's already the case for libiberty.

Heh.  I'm trying to get libiberty to be three-staged, or at least 
two-staged, as part of the bootstrap move.  This is actually not that hard.
What's hard is getting the *gcc* directory to *understand* the three-staged
libiberty, which is what has delayed me more than once.

At the moment I'm working on finishing my original cleanup of the top 
level, since that's also a prerequisite for me to move bootstrap. :-/
Luckily that should be done soon.

--Nathanael