avformat/smoothstreamingenc: Make const tables static const

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/spdifenc make const tables static const

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avutil/hmac: make const tables static const

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