ao_wasapi: Initial conversion to the new pull model

Gets rid of the internal ring buffer and get_buffer. Corrects an
implementation error in thread_reset.

There is still a possible race condition on reset, and a few refactors
left to do. If feasible, the thread that handles everything
WASAPI-related will be made to only handle feed events.
ao_wasapi: Split into 2 files

ao_wasapi.c was almost entirely init code mixed with option code and
occasionally actual audio handling code. Split most things to
ao_wasapi_utils.c and keep the audio handling code in ao_wasapi.c.
ao_wasapi: Move non-critical code outside of the event thread

Due to the COM Single-Threaded Apartment model, the thread owning the
objects will still do all the actual method calls (in the form of
message dispatches), but at least this will be COM's problem rather than
having to set up several handles and adding extra code to the event
thread.

Since the event thread still needs to own the WASAPI handles to avoid
waiting on another thread to dispatch the messages, the init and uninit
code still has to run in the thread.

This also removes a broken drain implementation and removes unused
headers from each of the files split from the original ao_wasapi.c.
ao_wasapi: Implement per-application mixing

The volume controls in mpv now affect the session's volume (the
application's volume in the mixer). Since we do not request a
non-persistent session, the volume and mute status persist across mpv
invocations and system reboots.

In exclusive mode, WASAPI doesn't have access to a mixer so the endpoint
(sound card)'s master volume is modified instead. Since by definition
mpv is the only thing outputting audio in exclusive mode, this causes no
conflict, and ao_wasapi restores the last user-set volume when it's
uninitialized.
ao_wasapi: Implement AOCONTROL_UPDATE_STREAM_TITLE
ao_wasapi: Use the character set conversion functions from io.h

...rather than rolling out our own. The only possible advantage is that
the "custom" ones didn't use talloc.
build: fix version in mpv.pc
build: rename --enable-shared switch

Rename it to --enable-libmpv-shared. The option name didn't really
tell much. When we add the possibility to create a static library,
it would also be bad if that were named --enable-static (because it
would sound like it does what --static-build does).
build: automagically extract client library version

This reads MPV_CLIENT_API_VERSION from the source header, and turns it
into a 3 part version number.

E.g. if MPV_CLIENT_API_VERSION were 0x12abcdef, this would result in
"18.171.773615" (8 bits, 8 bits, 16 bits).

We'll see if this is actually useful, or if it's too clever.
stream_file: network file system detection for Linux

Addresses issue #558 on Linux systems.

Signed-off-by: wm4 <wm4@nowhere>
build: make check for BSD fstatfs() a bit more strict

Linux also has fstatfs(), and the test relied on certain system include
files being available on BSD, but not on Linux. It would break if Linux
added the missing includes for some reason.

Make it a bit stricter, and check for the struct statfs field the code
needs.