Rework ABCL-BUILD as a contrib · f8592464
ABCL-BUILD now more usefully installs necessary build machinery. Refactor the ABCL-BUILD Lisp based build to use use Ant, which allows us to canonicalize the build instructions in a much more configurable manner, restoring the cross-implementation build of ABCL for CL users who really do want to know about Java tooling. Since we want to use ASDF/UIOP anyways, this code is best expressed as an abcl contrib where such behavior can profitably take place. TODO: does not pass all tests TODO: API compatibility so that build-from-lisp.bash works TODO: If an invocable Ant cannot be found, then offer to install one via restart TODO: work backwards to the scenario that we are booting in pure interepreted mode without access to compilers.