responsibility adjustments
add `pkg-desc' and `pkg-authors' to each package

This information will be used to construct a catalog from the
package directories.
Windows: add dependency on "com" native-library package
distro-build: merge and improve package packing and cataloging

Use the `pkg-authors' and `pkg-desc' fields from "info.rkt"
when creating a catalog.

Also add an `archive-catalog' makefile target for assembling
archives (binary for native-library package, source others)
and a catalog in "build/archive".