Revert 9e09d9f0f8b57d61c8970a2d554add1714afb8d7

The dpkg-dev dependecy bump on dpkg is not needed anymore as the
compression variables are located in a new module provided by dpkg-dev.

debian/changelog

@@ -9,6 +9,8 @@ dpkg (1.14.15) UNRELEASED; urgency=low
   [ Guillem Jover ]
   * Move compression related variables to a new Dpkg::Compression module.
   * Remove disabled, obsolete and quite incomplete Hebrew translations.
+  * Revert dpkg-dev versioned dependency bump on dpkg >= 1.14.13 back to
+    >= 1.14.6, as the compression variables are now in a module in dpkg-dev.
 
   [ Updated dpkg translations ]
   * Norwegian Bokmål (Hans Fredrik Nordhaug). Closes: #457918

debian/control

@@ -34,7 +34,7 @@ Package: dpkg-dev
 Section: utils
 Priority: optional
 Architecture: all
-Depends: dpkg (>= 1.14.13), perl5, perl-modules, cpio (>= 2.4.2-2),
+Depends: dpkg (>= 1.14.6), perl5, perl-modules, cpio (>= 2.4.2-2),
  patch (>= 2.2-1), make, binutils
 Recommends: gcc | c-compiler, bzip2
 Suggests: gnupg, debian-keyring