* building some modules (lzma) on Darwin (use PREFIX, instead of /usr/local, to look for libraries)
* building decimal module on certain enviroments (use relative path to look for includes, as absolute path might get rejected by a wrapper)
are replaced with .include "../../devel/readline/buildlink3.mk", and
USE_GNU_READLINE are removed,
* .include "../../devel/readline/buildlink3.mk" without USE_GNU_READLINE
are replaced with .include "../../mk/readline.buildlink3.mk".
remove unnecessary conditional that broke build on NetBSD-6.99.15/amd64.
While here, replace another interpreter and skip one more file since
it gets replaced much later.
Bump PKGREVISION.