ao_pulse: disable latency calculation hacks by default

This used to be required to workaround PulseAudio bugs. Even later, when
the bugs were (partially?) fixed in PulseAudio, I had the feeling the
hacks gave better behavior. On the other hand, I couldn't actually
reproduce any bad behavior without the hacks lately. On top of this, it
seems our hacks sometimes perform much worse than PulseAudio's native
implementation (see #1430).

So disable the hacks by default, but still leave the code and the option
in case it still helps somewhere. Also, being able to blame PulseAudio's
code by using its native API is much easier than trying to debug our own
(mplayer2-derived) hacks.

audio/out/ao_pulse.c

@@ -782,7 +782,6 @@ const struct ao_driver audio_out_pulse = {
     .priv_size = sizeof(struct priv),
     .priv_defaults = &(const struct priv) {
         .cfg_buffer = 250,
-        .cfg_latency_hacks = 1,
     },
     .options = (const struct m_option[]) {
         OPT_STRING("host", cfg_host, 0),