Improve detection of %autorel/%autochangelog use
Previously, it wouldn't detect the optional forms of the macros, i.e.
%{?autorel} or %{?autochangelog}, respectively.
This change relaxes the regular expressions involved that they can cope
with this and (optionally) the inverted macro, so that maintainers can
use this to specify fallbacks if the macros aren't installed.
Signed-off-by: Nils Philippsen <nils@redhat.com>