[project @ 2004-08-16 11:17:20 by simonmar]

Add a config.h to ease the transition.  Now if you include config.h
you get a warning instead of a failure:

In file included from System/Posix/Internals.hs:24:
/playpen/ghc/nightly/HEAD-cam-02-unx/i386-unknown-linux/ghc/includes/config.h:4: warning: #warning config.h is deprecated; please use ghcconfig.h instead