Please transition gcr to multi-arch

[SRU] The debiffs attached to comments #4 and #5 backport the multi-arch changes from Saucy to Raring and Quantal respectively. See LP: #859600 for the Precise version.

[IMPACT]
libgcr-3-1:i386 and libgck-1-0:i386 are not installable on an x86_64 system.

[Test Case]
Run 'sudo apt-get install libgcr-3-1:i386' and verify that the files are installed in the correct location:
$ ls -l /usr/lib/i386-linux-gnu/libgcr*
$ ls -l /usr/lib/i386-linux-gnu/libgck*

[Regression Potential]
Low, changes only affect packaging.

libgcr-3-1:i386 depends on libgcr-3-common:i386, but this package doesn't exists, because libgcr-3-common is architecture independent.
===========================================================
$ LANG= sudo apt-get install libgcr-3-1:i386
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libgcr-3-1:i386 : Depends: libgcr-3-common:i386 but it is not installable
E: Unable to correct problems, you have held broken packages.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libgcr-3-1:i386 (not installed)
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sun May 13 14:05:01 2012
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=ru_RU.utf8
 LANGUAGE=ru_RU:ru:en_GB:en
SourcePackage: gnome-keyring
UpgradeStatus: Upgraded to precise on 2012-05-04 (9 days ago)