Add Szabolcs Nagy's deflate/inflate code from git://git.suckless.org/flate Confirmed with him on IRC it's ok to use under toybox license, glued the files together and hammered square peg into round hole, no other changes yet.

Posix commands

Commands defined in POSIX-2008, also known as the Single Unix
Specification version 4, available online at
http://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html