Get rid of source packages check in multistrap

[Vivek Raghunathan <nkrvivek@gmail.com>]

I'm trying to use Multistrap to create a filesystem based on two
different mirrors.

The local mirror I'm using doesn't have the sources package for the
deb files. I tried using multistrap and as multistrap requires sources
package for the deb's it fails during apt-get update.

Does someone know how to get rid of the sources check on multistrap or
work around it?

Vivek