Please unblock package tar

[ Reason ]
tar fails to build from source on 32 bits architectures (bug 1026204)
since the latest glibc version, because the test suite fails on files
with access dates outside of the 32-bit timestamps reach. This was
noticed because there was an NMU to fix the d/copyright. After quite
some discussion it was deemed best to enable lfs and -D_TIME_BITS=64
on 32 bits archs, which will be the default in the next tar upstream
version too.

[ Impact ]
Users on 32 bits systems wouldn't be able to rebuild tar. If there
would be a security update, it would fail to build too.

[ Tests ]
tar has a test suite that failed before the upload, now it passes.

[ Risks ]
In bug 1026204, wookey warned against implications of enabling 64-bit
time and large file system support, however the other people involved
in the bug and on IRC were convinced this was the right solution.
Because of this, I recommend to *not* age the package when unblocked,
but give it some time in unstable.

[ Checklist ]
  [no] all changes are documented in the d/changelog

I only noticed when I started to request this unblock that there are
two new files in the previous NMU that were not mentioned:
debian/upstream/metadata and debian/salsa-ci.yml, but I consider both
harmless enough to not do a new upload for that.

  [yes] I reviewed all changes and I approve them
  [yes] attach debdiff against the package in testing

[ Other info ]
helmut promised on IRC to care for fallout if it would occur.

unblock tar/1.34+dfsg-1.2

Unblocked.