If possible add externally maintained code below 'vendor'
at the top level in the PCP git repo.  See 'CONTRIBUTING'
file for details.

Lightweight HTTP parser
    - https://github.com/nodejs/http-parser/

sort_r (portable quicksort with closure)
    - https://github.com/noporpoise/sort_r

hash (portable performant hash function)
    - https://burtleburtle.net/bob/hash/evahash.html

crc16, dict, sha1, sha256 (hash and string helpers)
    - https://github.com/redis/redis/blob/6.0/src

Callback functions on main libuv thread
    - https://github.com/litesync/uv_callback

atop (system and process monitor)
    - https://github.com/Atoptool/atop
