python-pyxdg-0.25-1.21

- drop test-icon test that fails because its standard is too old
- drop hicolor-icon-theme requirement which was needed for that test

- Don't provide python2-xdg. Singlespec packages should use the
  correct name.

- Add literal python-xdg provides.

- Fix source url
- Various small spec file cleanups.

- Converted to single-spec
- Updated source URL

- It doesn't need a shared-mime-info version that high.
  The unit tests just compare against pre-set values based on that
  version.  So remove BuildRequires version check and disable
  tests for earlier openSUSE versions.

- Provide/Obsolete python-xdg
  For some reason there is already python-xdg which should be
  python-pyxdg according to guidelines (pypi name is pyxdg).

- Initial version