debian: Move to multi-arch support in libosmocore

Enable multi-arch support in libosmocore. This means the package
can not be built on squeeze anymore.

The concept of "foreign" is not really well documented but I
think I use it correctly here.
diff --git a/debian/control b/debian/control
index ed525b5..a9f9b15 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@
 Section: libs
 Priority: optional
 Maintainer: Harald Welte <laforge@gnumonks.org>
-Build-Depends: debhelper (>= 8.0.0), autotools-dev, autoconf, automake, libtool, dh-autoreconf, libdpkg-perl, git, doxygen, libpcsclite-dev, pkg-config
+Build-Depends: debhelper (>= 9), autotools-dev, autoconf, automake, libtool, dh-autoreconf, libdpkg-perl, git, doxygen, libpcsclite-dev, pkg-config
 Standards-Version: 3.9.3
 Homepage: http://bb.osmocom.org/trac/wiki/libosmocore
 Vcs-Git: git://git.osmocom.org/libosmocore.git
@@ -12,59 +12,69 @@
 Section: libs
 Architecture: any
 Depends: libosmocodec0, libosmocore6, libosmogb3, libosmogsm5, libosmovty1, ${misc:Depends}
+Multi-Arch: foreign
 Description: Open Source MObile COMmunications CORE library
 
 Package: libosmocodec0
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo codec library
 
 Package: libosmocore6
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo Core library
 
 Package: libosmogb3
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo GPRS GB library
 
 Package: libosmogsm5
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo GSM utility library
 
 Package: libosmovty1
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo VTY library
 
 Package: libosmoctrl0
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo control library
 
 Package: libosmosim0
 Section: libs
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
+Multi-Arch: same
 Description: Osmo SIM library
 
 Package: libosmocore-dev
 Section: libdevel
 Architecture: any
 Depends: ${misc:Depends}, libosmocore
+Multi-Arch: same
 Description: Development headers for Open Source MObile COMmunications CORE library
 
 Package: libosmocore-utils
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}, libosmocore
+Multi-Arch: same
 Description: Utilities for gsm
 
 Package: libosmocore-dbg
@@ -72,4 +82,5 @@
 Section: debug
 Priority: extra
 Depends: libosmocore (= ${binary:Version}), ${misc:Depends}
+Multi-Arch: same
 Description: Debug symbols for Open Source MObile COMmunications CORE library