Bug#964248: base-installer: Pass "--extra-suites=unreleased" to debootstrap on ports arches

[jhcha54008 <jhcha54008@free.fr>]

Hi,

Thank you for your work to improve the installability of port architectures !

Sorry for jumping so late into the discussion of the patch of bug #964248.

I wonder if the versioned dependency of apt-mirror-setting on base-installer 
is necessary. Bug #879130 was solved (thank you !), and since then we could 
just write :

is_ports_architecture=$(cat /usr/lib/choose-mirror/port_architecture)

Is it sufficient ?

And we were advised against hard-coding a list of port architectures [1].

I hope it will help nevertheless !

Regards,
JH Chatenet

[1] : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=690210#31