bug#507: compilation problem under Solaris

[Stefan Monnier]

> 2) replace this crazy cpp stuff with autoconf.

Of course.  This has been going on and should keep going until we can
finally get rid of it.
I.e. I encourage people to install incremental changes to reduce the use
of CPP and use autoconf in its place.  If someone wants to write a full
replacement (rather than incremental patches), that'd be good as well,
tho we'd probably want to wait for post-Emacs-23 before considering
installing it.


        Stefan