Update to Chicken 4.8.0.5.
Import marisa-0.2.4 as wip/marisa.

Matching Algorithm with Recursively Implemented StorAge (MARISA) is a
static and space-efficient trie data structure. And libmarisa is a C++
library to provide an implementation of MARISA. Also, the package of
libmarisa contains a set of command line tools for building and
operating a MARISA-based dictionary.