* Add buildlink.mk file to link appropriate libraries and headers into

  ${BUILDLINK_INCDIR} and ${BUILDLINK_LIBDIR}, to be used by other packages.

* Use buildlink.mk files to get dependencies and to prevent unintended
  linking against installed libraries or finding installed headers except
  for those that are explicitly linked into ${BUILDLINK_INCDIR} and
  ${BUILDLINK_LIBDIR}.

* Don't prototype history functions directly, but use
  <readline/history.h> to pull them in.  This allows us to use libedit's
  readline emulation.

* Change from USE_PERL5 to a build dependency on perl -- it's only used to
  generate a header file during the build.

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