libmikmod: add dependency on pulseaudio

* fixes following floating dependencies:
  libmikmod/libmikmod/latest lost dependency on  dbus-lib json-c libcap
    libice libpulse libpulse-simple libsm libsndfile1 libx11 libx11-xcb
    libxau libxcb

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>