autoconf 2.57 & setting of CC

[Phil Edwards]

I wrote:
> 
> I didn't think CC was involved, though

Bah, we /do/ still use $CC.  Thought I'd fixed that....

-- 
Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it.
    - Brian W. Kernighan