debian: Add missing Breaks on old libdpkg-perl to dpkg

Commit 9d7ba99cc3ff84fc553ed39da9d2e4f4008d35b6 renamed the
triplettable file to tupletable and added the necessary dpkg
dependency to libdpkg-perl, but did not forbid the other now broken
combination of old libdpkg-perl and new dpkg.

Closes: #843429
Signed-off-by: Guillem Jover <guillem@debian.org>

debian/changelog

@@ -3,6 +3,9 @@ dpkg (1.18.13) UNRELEASED; urgency=medium
   * Perl modules:
     - Do not try to load non-files in Dpkg::Dist::Files load_dir method.
       Fixes test failures on non-Linux architectures. Closes: #843436
+  * Packaging:
+    - Add missing Breaks on old libdpkg-perl to dpkg. Closes: #843429
+      Thanks to Sven Joachim <svenjoac@gmx.de>.
 
  -- Guillem Jover <guillem@debian.org>  Sun, 06 Nov 2016 06:28:11 +0100
 

debian/control

@@ -53,6 +53,8 @@ Breaks:
  systemtap (<< 2.8-1),
  terminatorx (<< 4.0.1-1),
  xvt (<= 2.1-20.1),
+# Due to renaming of triplettable to tupletable.
+ libdpkg-perl (<< 1.18.11),
 Description: Debian package management system
  This package provides the low-level infrastructure for handling the
  installation and removal of Debian software packages.