- re-add ALL_LINGUAS so that PO files are included with "make dist".
- re-add ALL_LINGUAS so that PO files are included with "make dist".

GerHobbelt/POPT,devzero2000/POPT,devzero2000/POPT,devzero2000/POPT,GerHobbelt/POPT,GerHobbelt/POPT,flatzo/popt,flatzo/popt