ao_wasapi0: Make it compile on cygwin64

Fixes format specifies that assume windows TYPEDEFS are as long as they look
like they are.

Remove calls to _beginthreadex and _endthreadex, these are only present on
microsoft's C runtimes. Replace by the otherwise identical CreateThread and
ExitThread calls.

This actually requires fixes to devicetopology.h, but the problem has been
(kinda) reported to mingw-w64:

<Kovensky> I see that those KSJACK* structs are supposedly declared in
  devicetopology.h itself, but for some reason (some of?) the decls that use
  them aren't seeing them?
<Kovensky> ok, it seems that it expects ks.h and ksmedia.h to declare those
  structs, but it doesn't
<Kovensky> the included files declare KDATAFORMAT, KSIDENTIFIER and LUID (and
  the associated pointer typedefs)
<Kovensky> but everything else is essentially inside #if 0
<Kovensky> changing the #ifndef _KS_ to only include KDATAFORMAT, KSIDENTIFIER
  and LUID (and putting the KSJACK stuff outside that #ifndef) makes the
  header compile
<Kovensky> it solves my immediate problem, but if that happened to begin with
  there's probably something more wrong with the ks headers :S