(java) Builds not reproducible on armhf

[Chris Hofstaedtler]

[..]
> Dates are 2022-06-08 as expected and not 1970-01-03 as described
> at tests.rb.o.
[..]
> >   https://tests.reproducible-builds.org/debian/history/armhf/vinnie.html

I briefly looked at vinnie. Given it is arch:all, I kinda expect it
to produce the "same" deb regardless of the arch it is built on.
libvinnie-java_2.0.2-3_all.deb in the archive was built on
x86-grnet-03, so on amd64. It does -not- contain a 1970-x-y
timestamp.

I'll note that fakeroot was probably broken on armel, armhf since
the t64 migration until mid-August.
Is fakeroot involved in any way? If so, it might make sense to
discard any results from that period.

Chris