md5/sha512: a better fix for strict aliasing warnings

The locations *are* well-aligned for direct stores
on any architecture.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
nslookup: set default DNS server again. Hopefully helps with 675

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>