EXTRA_DIST: Fix missing files with "make dist"

EXTRA_DIST: Fix missing files with "make dist"

I recently noticed that the generated tarballs with "make dist"
were incomplete unless the configure script was run on a machine
with all possible build dependencies.

That's wrong as you clearly don't need those dependencies to generate
the tarball. This change fixes that.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>