Bug#1089099: qml6-module-qtquick3d fails to coinstall

[Helmut Grohne <helmut@subdivi.de>]

Package: qml6-module-qtquick3d
Version: 6.7.2-5
Severity: serious
Justification: installation failure from dpkg

When coinstalling qml6-module-qtquick3d, apt and dpkg disagree. apt
thinks it is satisfiable, but dpkg not:

| dpkg: dependency problems prevent configuration of qml6-module-qtquick3d:amd64:
|  qml6-module-qtquick3d:armel (6.7.2-5) breaks qml6-module-quick3d and is unpacked but not configured.
|   qml6-module-qtquick3d:amd64 (6.7.2-5) provides qml6-module-quick3d.
| 
| dpkg: error processing package qml6-module-qtquick3d:amd64 (--configure):
|  dependency problems - leaving unconfigured

You cannot combine the three of:

 * Provides: qml6-module-quick3d
 * Breaks: qml6-module-quick3d
 * Multi-Arch: same

While apt ignores self-conflicts across architectures, dpkg considers
them valid and refuses to coinstall. In principle, this is a problem in
apt or dpkg (or both), but at present you cannot use this metadata.
Removing any of these lines fixes the problem (while introducing other
problems of course). I fear I don't have a good solution, but this is
broken. Don't shoot the messenger please.

Helmut