Log Message:
Reimported pkglint-4.518 from pkgtools/pkglint as pkglint4

The Perl version of pkglint (pkglint<5.0) runs on all platforms that
are supported by pkgsrc. Not so the Go version (pkglint>=5.0).

To support development of packages on all platforms, this version is
provided, and it will be supported equally. Its output differs a bit
from pkglint>=5.0, but the basic checks are the same.