Pyffi - Use Python from Racket

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@samth

I think you want to use some combination of the #:fail argument to ffi-lib and make-not-available with define-ffi-definer to make the relevant functions error when called rather than when the modules are required.

I did try that line of attack. I can get ffi-lib to return a value that indicates, that the library is not loaded.
However define-ffi-definer signals an error, when it is passed a non-lib.
The make-not-available option is for the individual functions.

It's possible to cheat - i.e. pass a different library to define-ffi-definer but that's at best a hack.

Also, in regular use, I'd expect an error when the library is not present.
Since pyffi is require for-label the loading happens before the code in the Scribble file runs - so I don't see a way for the documentation to set a flag suppressing the error.