#914208: Disable merged /usr by default when making a buildd chroot

Merged /usr is known to cause multiple packages to be misbuilt. As long as we support unmerged /usr for user systems, we should mitigate this class of bugs by using unmerged-/usr chroots on official buildds, resulting in binary packages that work equally well on merged- or unmerged-/usr user systems.

See also:

• https://bugs.debian.org/913229
• https://udd.debian.org/cgi-bin/bts-usertags.cgi?user=md@linux.it&tag=usrmerge
• thread starting at https://lists.debian.org/debian-devel/2018/11/msg00299.html

Signed-off-by: Simon McVittie smcv@debian.org Bug: https://bugs.debian.org/914208

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I think this might be a good pragmatic approach to packages that build differently in a merged-/usr environment. What do you think?