Workaround: This avoids libspeex printing warnings on Opus streams.
libspeex reports warnings in case of oddnesses with the data to stderr. However Icecast2 uses those functions in it's codec probeing process. This way libspeex will write messages to a posibily reused random handle. This is clearly a bug by package maintainers of libspeex. See the source code of this change as well as libspeex's source code as reference.