Allow overriding XDG_APP_BINDIR using make vars
Allow overriding XDG_APP_BINDIR using make vars

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