flatpak-builder: don't strip zip files
flatpak-builder: don't strip zip files

It is allowed to make a self-executable zip, it will then be an ELF file
on Linux. The problem is that the current stripping code somehow breaks
that file (i.e. ./file.zip doesn't work anymore after stripping).

Signed-off-by: Niv Sardi <f614dcc26eff58137ed1b21c6509143c66dce713@endlessm.com>

GeorgesStavracas/flatpak,flatpak/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,GeorgesStavracas/flatpak,flatpak/flatpak,matthiasclasen/flatpak,GeorgesStavracas/flatpak,handsome-feng/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak,GeorgesStavracas/flatpak,flatpak/flatpak,handsome-feng/flatpak,flatpak/flatpak,GeorgesStavracas/flatpak,flatpak/flatpak,matthiasclasen/flatpak,handsome-feng/flatpak,matthiasclasen/flatpak