Bug#993503: gcc-11-base: coinstallation error for mipsel

[Helmut Grohne <helmut@subdivi.de>]

Package: gcc-11-base
Version: 11.2.0-3
Severity: serious
Justification: dpkg unpack error

gcc-11-base's changelog.Debian.gz is different on mipsel than everywhere
else. Indeed, the version is duplicate in the changelog. As such,
gcc-11-base:mipsel fails to coinstall with everything else despite being
marked Multi-Arch: same.

| Unpacking gcc-11-base:mipsel (11.2.0-3) ...
| dpkg: error processing archive /tmp/apt-dpkg-install-kpSb1U/012-gcc-11-base_11.2.0-3_mipsel.deb (--unpack):
|  trying to overwrite shared '/usr/share/doc/gcc-11-base/changelog.Debian.gz', which is different from other instances of package gcc-11-base:mipsel

The cause seems to be a binary upload. Any normal upload should fix this
issue without further changes.

Helmut