d/control: relax Replaces & Breaks from lib packages to iptables

libiptc0, libip4tc0 and libip6tc0 don't need a Replaces & Breaks
with iptables, given the library files were moved to multi-arch paths
(so there is no file conflict with the old iptables package).

The -dev packages are different, because they have conflicting paths with
the old iptables-dev package.
Suggested-by: Michael Biebl <biebl@debian.org>
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

debian/control

@@ -81,8 +81,6 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Replaces: iptables (<< 1.6.0-3)
-Breaks: iptables (<< 1.6.0-3)
 Description: netfilter libipt library
  The user-space iptables C library from the Netfilter xtables framework.
  .
@@ -115,8 +113,6 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Replaces: iptables (<< 1.6.0-3)
-Breaks: iptables (<< 1.6.0-3)
 Description: netfilter libi4pt library
  The user-space iptables (IPv4) C library from the Netfilter xtables framework.
  .
@@ -146,8 +142,6 @@ Architecture: linux-any
 Section: libs
 Pre-Depends: ${misc:Pre-Depends}
 Depends: ${misc:Depends}, ${shlibs:Depends}
-Replaces: iptables (<< 1.6.0-3)
-Breaks: iptables (<< 1.6.0-3)
 Description: netfilter libipt library
  The user-space iptables (IPv6) C library from the Netfilter xtables framework.
  .