Log Message:
* Strip out unnecessary path components in the PLIST so that check-files
  isn't confused by the "pkg_info -qL" output.

* Add a MESSAGE file noting what should be added to the kernel config
  file in order to use darwin_lib.

* Add an INSTALL script that creates the /emul/darwin symlink needed by
  NetBSD to use darwin_lib.

Bump the PKGREVISION to 2.  This fixes the error noted in the bulk build
results:

    http://mail-index.netbsd.org/pkgsrc-bulk/2006/06/20/0000.html