phonemes: map /{lbv}/ to /{vel,lzd}/

Kirshenbaum uses /{lbv}/ (labio-velar) for the co-articulated
labialized velar (/{vel,lzd}/) consonants listed in the IPA chart.
Kirshenbaum does not have a corresponding /{lbp}/ feature for the
labialized palatal (/{pal,lzd}/) consonants.

To be consistent in the feature mapping and with the IPA chart,
/{lbv}/ is mapped to /{vel,lzd}/ instead of using a separate
feature for it.