Remove dependency on speex
Remove dependency on speex

Cherry-picked from VLC commit 0f025b2eea9e2ae08b48209cbe5456c82caa3f47

Signed-off-by: Tristan Matthews <58557b70081517323d8b069e20d681de970f25f5@gmail.com>

felipebetancur/speexdsp,ksophocleous/speexdsp,maolin-cdzl/speexdsp,ksophocleous/speexdsp,felipebetancur/speexdsp,maolin-cdzl/speexdsp,felipebetancur/speexdsp,ksophocleous/speexdsp,maolin-cdzl/speexdsp,ksophocleous/speexdsp,felipebetancur/speexdsp,maolin-cdzl/speexdsp