common: Make XdgAppDir soup session initilization threadsafe
common: Make XdgAppDir soup session initilization threadsafe

GeorgesStavracas/flatpak,flatpak/flatpak,alexlarsson/xdg-app,GeorgesStavracas/flatpak,amigadave/flatpak,alexlarsson/xdg-app,matthiasclasen/xdg-app,GeorgesStavracas/flatpak,matthiasclasen/flatpak,alexlarsson/xdg-app,matthiasclasen/xdg-app,GeorgesStavracas/flatpak,flatpak/flatpak,flatpak/flatpak,amigadave/flatpak,amigadave/flatpak,matthiasclasen/flatpak,matthiasclasen/xdg-app,flatpak/flatpak,alexlarsson/xdg-app,handsome-feng/flatpak,amigadave/flatpak,matthiasclasen/flatpak,flatpak/flatpak,handsome-feng/flatpak,GeorgesStavracas/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,matthiasclasen/xdg-app,handsome-feng/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak