Log Message:
Update py-xdg to 0.19.
Based on PR#43747 by Kamel Derouiche.

Version 0.19
    * IniFile.py: add support for trusted desktop files (thanks to karl mikaelsson)
    * DesktopEntry.py: Support spec version 1.0, Debian bug #563660
    * MimeType.py: Fix parsing of in memory data, Debian bug #563718
    * DesktopEntry.py: Fix constructor, Debian bug #551297, #562951, #562952

Version 0.18

    * DesktopEntry.py: Add getMimeTypes() method, correctly returning strings
    * DesktopEntry.py: Deprecated getMimeType() returning list of regex
    * Menu.py: Add support for XDG_MENU_PREFIX
    * Mime.py: Add get_type_by_contents()