[Yhc] Adding base libraries to yhc

[Isaac Dupree]

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>> 1) I should enable -cpp specifically for this file or globally for all of
>> yhc, or just for packages/.  (I'm not entirely sure how to get scons
>> to do
>> this but I need to take time and read the scons docs.)
> 
> I think this is the easiest one to do. I'd enable it for all packages/
> in the scons script - compiling the other packages with -cpp is
> unlikely to be an issue. Andrew can probably advise about the scons
> side of things.

I would think that nowadays the appropriate way to specify this is to
put {-# LANGUAGE CPP #-} at the beginning of each file that needs it? see
http://www.haskell.org/ghc/docs/latest/html/users_guide/pragmas.html#language-pragma
"This allows language extensions to be enabled in a portable way. It is
the intention that all Haskell compilers support the LANGUAGE pragma
with the same syntax, although not all extensions are supported by all
compilers, of course." ...

Isaac
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