CFFI govels size_t into :sizet

[Robert P. Goldman]

Note that if one really doesn't like what VERSION-SATISFIES does, it's a
method.  You could specialize it on your own component (possibly even
EQL-specify it on the CFFI system, or make a trivial subclass of SYSTEM
for CFFI).

Then, if you wanted to add, e.g., "rc", "alpha", or "trial", you could
do that.

Cheers,
r