Log Message:
pkgtools/url2pkg: update to 19.3.4

Changes since 19.3.3:

The code that handles license names is the same for Python and Perl
modules.

Python packages that use distutils.extension can be handled. An example
package is devel/py-pysha3.

The DESCR file is filled from the package's README file.

The PLIST is generated with some comments providing further assistance.