hybris/pulseaudio-modules-droid: Fix compatibility with pulseaudio>=13.0

There were some API changes:

• https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/878ef440797f0fe319dcb1e866c29cec39b8a36d
• https://gitlab.freedesktop.org/pulseaudio/pulseaudio/commit/6665b466d28ca6f166c22846777f541f5bc9cef7

Leading to:

• Error relocating /usr/lib/pulse-13.0/modules/libdroid-sink.so: pa_make_realtime: symbol not found
• Error relocating /usr/lib/pulse-13.0/modules/libdroid-source.so: pa_make_realtime: symbol not found
• Error relocating /usr/lib/pulse-13.0/modules/libdroid-source.so: pa_source_get_state: symbol not found

Fixes are:

• #include <pulse/util.h>, replace pa_make_realtime -> pa_thread_make_realtime
• replace pa_source_get_state(X) -> X->state
• replace pa_sink_get_state(X) -> X->state

Fixes !634 (merged)