Third Ubuntu Xenial Xerus test rebuilds (all components, all architectures)

[Matthias Klose]

The third test rebuild of Xenial Xerus was started on April 01 (no joke) for all
architectures, all components (it is finished besides some pending builds for 
powerpc and armhf).  Compared to the last test rebuild this sees some new build 
failures introduced by new upstream versions during the feature freeze (e.g. glibc).

Results (please also look at the superseded builds) can be found at

http://people.ubuntuwire.org/~wgrant/rebuild-ftbfs-test/test-rebuild-20160401-xenial.html

For arm64 and armhf the gcc-5 packages are based on the Linaro 5-2016.03
snapshot.

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

Please help fixing the build failures.

   Matthias