Log Message:
Update audio/portaudio-devel to 190600 (20161030).

All Platforms

- Add new version number API (see above)
- Updated version number to 19.6.0 (due to extension added to WASAPI
  host-API specific)
- pa_process: Fix output channel adaption by not skipping the conversion
  when the host and user number-of-channels are not equal.
  Leif Asbrink. c0c0cb1414
- Fixed bug that would result in open streams not being closed when
  Pa_Terminate() is called
- C++ binding: make operator == and != const.
- Moved repository to Git

Various documentation improvements, including:
- Update docs for building on Linux
- Clarified safety of operations in callback
- Document API Version Availability (e.g. `Available as of 19.5.0`)

Build Systems
- CMake support for Unix platforms
- Fix PA_LIBRARY_DEPENDENCIES problem with CMake/WMME.

Linux
- pa_linux_alsa: fix hang in callback caused by abort.

Mac
- Update configure files for Mac OS X El Capitan, 10.11 SDK
  pa_mac_core_blocking: fix hang when running stream stopped (add
  timeout).
- pa_mac_core: Fix assert when reading or writing with non-power of 2
  channels. Now Scarlett 6i6 works.
- pa_mac_core: stop stream instead of asserting (crashing) under certain
  conditions, e.g. when device is unplugged.
- pa_mac_core: fixed copy-pasto: last host error was being associated
  with paInDevelopment host api not paCoreAudio
- pa_mac_core: Fix for truncated device names e.g. 'Built-in
  Microph'