debian/control: replace, conflict: osmo-libasn1c

In debian, this Osmocom fork of libasn1c is packaged as osmo-libasn1c.
Add related Replaces: and Conflicts: to debian/control, so there is no
error when installing osmo-libasn1c from Debian first, then configuring
the Osmocom package repositories and trying to install libasn1c from
there.

Fix for:
  Preparing to unpack .../08-libasn1c1_0.9.34.1.71cb.202302010006_amd64.deb ...
  Unpacking libasn1c1:amd64 (0.9.34.1.71cb.202302010006) ...
  dpkg: error processing archive /tmp/apt-dpkg-install-8zK3sm/08-libasn1c1_0.9.34.1.71cb.202302010006_amd64.deb (--unpack):
   trying to overwrite '/usr/lib/x86_64-linux-gnu/libasn1c.so.1.0.1', which is also in package osmo-libasn1c1:amd64 0.9.32-1+b1
  dpkg-deb: error: paste subprocess was killed by signal (Broken pipe)

Related: OS#5318
Related: https://salsa.debian.org/debian-mobcom-team/osmo-libasn1c/-/blob/master/debian/control
Related: https://osmocom.org/projects/cellular-infrastructure/wiki/Binary_Packages
Change-Id: I5116df35b5819c22a184057cdf6ed756974d6388

debian/control

@@ -1,4 +1,6 @@
 Source: libasn1c
+Conflicts: osmo-libasn1c
+Replaces: osmo-libasn1c
 Section: libs
 Priority: extra
 Maintainer: Osmocom team <openbsc@lists.osmocom.org>
@@ -11,6 +13,8 @@ Vcs-Browser: http://git.osmocom.org/gitweb?p=libasn1c.git;a=summary
 Homepage: https://projects.osmocom.org/projects/libasn1c
 
 Package: libasn1c1
+Conflicts: osmo-libasn1c1
+Replaces: osmo-libasn1c1
 Section: libs
 Architecture: any
 Multi-Arch: same
@@ -19,6 +23,8 @@ Depends: ${misc:Depends}, ${shlibs:Depends}
 Description: asn1c runtime code as shared library
 
 Package: libasn1c-dbg
+Conflicts: osmo-libasn1c-dbg
+Replaces: osmo-libasn1c-dbg
 Section: debug
 Architecture: any
 Multi-Arch: same
@@ -26,6 +32,8 @@ Depends: libasn1c1 (= ${binary:Version}), ${misc:Depends}
 Description: asn1c runtime code as shared library
 
 Package: libasn1c-dev
+Conflicts: osmo-libasn1c-dev
+Replaces: osmo-libasn1c-dev
 Section: libdevel
 Architecture: any
 Multi-Arch: same