Fix ui3842 - Exclude non-free emacs23 from repos

This is the companion to package-helpers!74 (merged) . With emacs24 in the repo, emacs23 which is missing some essential source code can now be dropped.

purge-trusty

@@ -27,6 +27,13 @@ cia-clients
d4x
easycrypt
efilinux-signed
+emacs23
+emacs23-bin-common
+emacs23-common
+emacs23-common-non-dfsg
+emacs23-el
+emacs23-lucid
+emacs23-nox
envyng-*
fglrx-*
freesci