Bug#949843: Missed part of systemd-nspawn patch

[Daniel Schepler]

I just realized based on some testing that I forgot to send part of
the patch, which is needed for sbuild-update to work with the
systemd-nspawn chroot backend.
-- 
Daniel Schepler

Description: missed part of systemd-nspawn backend patch needed for sbuild-update
Author: Daniel Schepler <dschep...@gmail.com>

--- sbuild-0.78.1.orig/lib/Sbuild/Utility.pm
+++ sbuild-0.78.1/lib/Sbuild/Utility.pm
@@ -99,6 +99,9 @@ sub setup ($$$) {
     } elsif ($conf->get('CHROOT_MODE') eq 'unshare') {
 	require Sbuild::ChrootInfoUnshare;
 	$chroot_info = Sbuild::ChrootInfoUnshare->new($conf);
+    } elsif ($conf->get('CHROOT_MODE') eq 'systemd-nspawn') {
+	require Sbuild::ChrootInfoNspawn;
+	$chroot_info = Sbuild::ChrootInfoNspawn->new($conf);
     } else {
 	require Sbuild::ChrootInfoSudo;
 	$chroot_info = Sbuild::ChrootInfoSudo->new($conf);