Log Message:
pkgtools/url2pkg: update to 19.3.2

Changes since 19.3.1 (only to the Python implementation):

* In Python packages, the variables LICENSE, HOMEPAGE and COMMENT are
  filled from their counterparts in setup.py, no matter whether
  the package uses setuptools or distutils.core.

* For buildlink3 dependencies, the variables BUILDLINK_DEPENDS and
  BUILDLINK_API_DEPENDS are added to the package Makefile.

* The DESCR and PLIST files are only created if they are missing.
  Existing files are not overwritten.

* Packages that contain .po files will set USE_PKGLOCALEDIR=yes.
  Before, only packages that contained .mo or .gmo did that.

* More download URLs from SourceForge can be handled.

* SourceForge packages get their HOMEPAGE set correctly.

* When matching the URL against the MASTER_SITE_* variables, the
  protocol is ignored. This allows https URLs to use the
  MASTER_SITE_GNU, which still uses http.

* Python packages from GitHub only get their MASTER_SITES converted to
  PyPI if they can be actually downloaded from there as well. This
  check was missing before.