Add 128 bit murmur3 hash function.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Add a generic hash API.

Also use this API in framemd5.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
md5enc: don't reuse priv_class in two formats

Apparently, this is not allowed and can trip up all sorts of things.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>