final (?) build system update

This pull request introduces a pattern rule for the build rules to match the one available for the configure rules.  There are two preliminaries and two more cosmetics commits that move around some lines for increased overall neatness.

At this point, my patch queue is empty.  Enjoy your shiny new build system.  My total commit count is now at 99; clearly I need to find at least one more thing to contribute to S2E ;-p