RFC: INLINE defcfun and auto FTYPE declarations [with patch]

[Andrzej Walczak]

Dear CFFI developers!

Recently we have migrated one of our largest projects from our home-grown
foreign-function interface implementation to CFFI.
The project is almost 1M LOC with almost 1K of foreign-functions.

Previously, we have inlined all of our foreign-function stubs. We also use
FTYPEs through the code for type-safety and optimization.
Having CFFI functions inlined and FTYPEs generated would spare us from
writing those declarations on our own.

The attached patch contains a proposal that we would like to share.
Please, let us know about any modification necessary that would make this
patch useful for a larger community.

FYI: We have tested the patch against about a hundredth open-source Lisp
projects.

Kindly,

-- 
Andrzej Walczak
(Google/ITA Software Engineer)
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