Log Message:
Import libmspack-0.5alpha as archivers/libmspack from pkgsrc-wip/libmspack.

The purpose of libmspack is to provide compressors and decompressors,
archivers and dearchivers for Microsoft compression formats: CAB, CHM, WIM,
LIT, HLP, KWAJ and SZDD. It is also designed to be easily embeddable,
stable, robust and resource-efficient.