reproducible debian: build.sh: temporary disable sending buildinfos to...

reproducible debian: build.sh: temporary disable sending buildinfos to buildinfo.kfreebsd.eu, as they bounce back

<submit@buildinfo.kfreebsd.eu>: delivery temporarily suspended: connect to
    buildinfo.kfreebsd.eu[176.9.50.39]:25: Connection refused

Signed-off-by: Mattia Rizzolo <mattia@debian.org>