options: consistently use return statuses to report errors (more) This is a follow-up to commit 'v1.13.1d-128-g6e486c5', needed to deal with errors that are only present in the 'master' branch (while the reported commit was on the 'maint' branch). * lib/Automake/Options.pm (_process_option_list): Adjust, where dealing with the removed options 'dist-shar' and 'dist-tarZ'. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>