Dear Maintainer,

The pypy plugin, as provided, compiles on the fly cffi wrappers to interface
C, python and libpypy. This requires gcc and some -dev packages for headers
included by uwsgi.h at runtime.

The binary package should be usable without developement tools installed.
The current code does not support this. Current code should migrate from
using ffi.verify()[1] to ffi.compile()[2] and the binary package should
distribute built assets.

ffi is also used in the plugin to access a preprocessed uwsgi.h . This should
be doable with gcc -E at build time.

[1] https://cffi.readthedocs.io/en/stable/cdef.html#ffi-verify-in-line-api-mode
[2] https://cffi.readthedocs.io/en/stable/cdef.html#ffibuilder-compile-etc-compiling-out-of-line-modules