Bug#1151073: rkcommon should be Architecture: any

[Adrian Bunk]

Source: rkcommon
Version: 1.15.2-1
Severity: important
Tags: ftbfs
X-Debbugs-Cc: Francois Mazen <mzf at debian.org>, Antoine Lassagne <antoine.lassagne at canonical.com>, Debian Multimedia Maintainers <debian-multimedia at lists.debian.org>, Matteo F. Vescovi <mfv at debian.org>
Control: affects -1 src:blender

blender started build depending on librkcommon-dev,
which is currently only available on amd64 and arm64.

debian/rules of rkcommon seems to handle other architectures,
and it builds for me on riscv64.

Please change rkcommon to
  Architecture: any
unless there is an actual reason for not doing so I missed.