Bug#712116: DPkg::Pre-Install-Pkgs should receive multiarch-qualified package names

[Anders Kaseorg <andersk@MIT.EDU>]

Package: apt
Version: 0.9.7.7

The current input format for DPkg::Pre-Install-Pkgs hooks makes it 
impossible to tell which architecture of a multiarch package is being 
removed.  For example, removing libbz2-1.0:amd64 and libbz2-1.0:i386 
results in this input:

libbz2-1.0 1.0.6-4 > - **REMOVE**
libbz2-1.0 1.0.6-4 > - **REMOVE**

Can we change the format to arch-qualify the package names as 
${binary:Package} does?

Thanks,
Anders