While building legacy dist sets incorrect target 'dvd1' was used
to set dependency on packagesystem. Because of that generated archives
were incomplete and MANIFEST file was missing.

Signed-off-by: Krzysztof Galazka <kgalazka@FreeBSD.org>

Fixes: 3f494a4e5ce0 (release: Add NODISTSETS to skip legacy dist sets)
Sponsored by: Intel Corporation