audio/audacity: Remove bogus STATIC_WX option

This was accepted by me in r495224. STATIC_WX_ENABLE was probably
supposed to be STATIC_WX_CONFIGURE_ENABLE but the entire idea of
the option is flawed. wxgtk31 does not provide static libraries.

While here drop unhooked JACK_LIB_DEPENDS options helper. Audacity
has been using the system Portaudio for a while and JACK support
can be enabled there.