Allow backports of the debhelper/dpkg-dev build-deps.

debian/control

@@ -5,8 +5,8 @@ Maintainer: Debian CMake Team <pkg-cmake-team@lists.alioth.debian.org>
 Uploaders: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>,
            Felix Geyer <fgeyer@debian.org>,
            Mario Lang <mlang@debian.org>
-Build-Depends: debhelper (>= 9.20141010),
-               dpkg-dev (>= 1.17.14),
+Build-Depends: debhelper (>= 9.20141010~),
+               dpkg-dev (>= 1.17.14~),
                libarchive-dev (>= 2.8.0),
                libbz2-dev,
                libcurl4-openssl-dev | libcurl-ssl-dev,