libintl for i18n needs. Changes since version 0.12.4 are *lots* of bug
fixes, module namespace reorganization, several _incompatible_ VM changes,
and the addition of several new modules, including a safe-interpreter for
untrusted bytecodes.
Add a new USE_LIBTOOL definition that uses the libtool package instead of
pkglibtool which is now considered outdated.
USE_PKGLIBTOOL is available for backwards compatibility with old packages
but is deprecated for new packages.