[gramlib] [build] Switch make-based system to packed gramlib

This makes the make-based build system stop linking to Camlp5's
gramlib and instead links to our own gramlib.

We use the style done in the packing of `Stdlib` in OCaml 4.07.

As to introduce a minimal amount of noise in history we use an
autogenerated `gramlib__pack` directory.

Co-authored-by: Gaëtan Gilbert <gaetan.gilbert@skyskimmer.net>

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