* Installation was broken with non-bash /bin/sh (thanks to
Niimi Satoshi for the patch)
* DEFAULT-EXTERNAL-FORMAT would now try to print a warning for
an invalid external format before streams had been initialized,
causing an infinite error loop (reported by Hannu Koivisto).
Temporary fix is just not printing the warning, a better fix
will wait until after the freeze.
* Also stop autodetecting the external format from the locale
on non-unicode builds. Having a default external format that's
incompatible with CHARACTER doesn't seem very sensible, especially
now that the external formats are also used for SB-ALIEN:C-STRING
instead of just streams.