XXX: Isn't really used right now, since the shared library isn't built. Needs tweaking.
Add a new USE_LIBTOOL definition that uses the libtool package instead of pkglibtool which is now considered outdated.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.
Submitted in PR 8963 by Bill Studentmind (wrstuden@netbsd.org>, thanks!