- Update to 0.26.0:
* IconTheme: Add support for Scale and ScaledDirectories keys.
* DesktopEntry: New method findTryExec()
* Menu: More efficient processing of filter rules by building a Python AST
* Mime: Prefer the first mimetype found for a file extension, instead of the last
* Mime: Allow unknown magic-matching rule formats
* Mime: GlobDB has new methods first_match and all_matches for matching paths
* Mime: New function get_extensions to get extensions for a given mime type
* Mime: Fix MagicDB.match_data crashing with an unknown 'possible' mimetype
* Mime: Correctly handle __NOMAGIC__ rule removing previous magic matches
* Menu: XML parsing reworked
* BaseDirectory: More secure creation of a fallback runtime directory with get_runtime_dir(strict=False)
* Various miscellaneous improvements to testing.

- Fix provides/obsoletes to actually provide python2-xdg too