executor: add `zlib` decompression header file

Create a header file to provide a clean entrypoint `puff_zlib_to_file()`,
which decompresses `zlib` data from an array to a file. This will be
used for pseudo-syscalls which accept compressed data, e.g.
`syz_mount_image`. The implementation uses a slightly-modified version
of `puff.{c,h}`, found in the `zlib` repository.

We have to be careful to ensure the copyright information from
`puff.{c,h}` gets included in generated C code and C reproducers.
Therefore, introduce the `//%` pattern to indicate comments which should
not be removed by code generation, and use this pattern for the
copyright notice.

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