scripts/*: add Makefile generator.

Zach van Rijn requested to merge zv/genmake into current

This commit adds a few scripts to the packages repository:

  • configure

    Typical 'configure' script; run to see usage.
  • scripts/genmake

    Generates a top-level 'Makefile' that will either
    build packages in the correct order, or sleep to
    simulate package builds. The main purpose of this
    tool is to enable concurrent package builds, and
    to provide a framework to analyze build strategies.

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