Log Message:
pkgtools/pkglint: update to 20.1.4

Changes since 20.1.3:

For patches that patch a single file, the filename of the patch should
correspond to the patched file. There are a few different naming schemes
in action, therefore the check is relatively loose. Patches that are
called patch-[a-z][a-z] continue to be allowed for historic reasons.
Patches that are called patch-CVE-* are also allowed.

The entries in doc/CHANGES-* are checked for consistency. For example,
it doesn't make sense to add a package twice or "update" a package from
version 1.0 to version 1.0. All version numbers in these entries must
be valid pkgsrc versions, i.e. start with a digit and only use
characters from -.0-9A-Z_a-z.