First Focal Fossa test rebuild

[Matthias Klose]

The first test rebuild of Focal Fossa was started on December 20 2019 for
all architectures, all components. The rebuild is finished except for some
pending universe/multiverse builds on armhf and arm64.

A first glance at the test results shows some missing dependencies for i386
builds, and some missing dependencies for Python2 related packages.

Please note that the test rebuild is done for the release pocket only.  For the
first time we have a test rebuild with such a vast amount of packages stuck in
the proposed pocket.  So besides fixing build failures, please also follow-up on
getting packages migrated to the release pocket.

Results (please also look at the superseded builds) can be found at

https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20191220-focal-focal.html

The report uses some additional color coding, marking packages different which
always failed to build, or where the build failure is no regression compared to
eoan.

Additional build failures for packages in focal-proposed (not yet in focal)
can be found at http://qa.ubuntuwire.com/ftbfs/

Please help fixing the build failures.

There is also a test rebuild with binutils and GCC trunk enabled by default.
Focal will ship with binutils 2.34, and GCC 10 (as an optional compiler, not the
default).

https://people.canonical.com/~doko/ftbfs-report/test-rebuild-20191220-focal-gcc10-focal.html

Matthias