Bug#360134: stop using cdbs System/Cpu fields

[Peter Eisentraut]

Package: grub2
Severity: wishlist

This package uses the cdbs control auto update feature.  As part of this
feature one can specify the fields System: and Cpu: in place of
Architecture: to allow a more fine-grained selection of architectures.
This feature was added with the apparent presumption that dpkg-dev would
eventually understand this syntax as well, but in fact dpkg-dev now
supports a different syntax.  Therefore, the cdbs-specific syntax will
be removed as soon as possible.

To switch to the dpkg-supported syntax, replace

Cpu: i386, powerpc
System: any

by

Architecture: any-i386 any-powerpc

and add a build dependency on dpkg-dev (>= 1.13.12).