This patch adds a small waf tool to add support for the QCC compiler,
which has a somewhat different command line syntax from GCC.  It also
fixes some small C++ issues which arise when trying to compile with the
QCC C++ library.

Change-Id: Id6ee4284095198bff206e45aa0e9a5fa5a2f8b74

This patch adds optional support for systemd, by adding use of the
sd_notify() function to allow jackd to report when the daemon has
started and stopped.  This is similar to the Apple notification
support which is already present.

This patch adds a missing case to the tests wscript, to handle the QNX
platform.  It also adds code to the setup for the various directory
macros, to handle the case when the build is taking place on Windows,
to ensure that the directory paths still come across in POSIX format.

Change-Id: If8054284d390e40c97c8c585af2851e94275aad8

Adds a driver for QNX io-audio system that acts as a JACK client.

Adds enough support and platform-specific files to get JACK building
on QNX SDP 6.6.0. This does not include any integration with the QNX
audio system, io-audio.

look prettier

use the header)

(fixes builds with nonstandard out directory)

The mmsystem.h header check didn't include windows.h so check fails even though mmsystem.h was present.

(the AutoOption class takes care of defining env['SAMPLERATE'] and HAVE_SAMPLERATE)

(drop conf.define('HAVE_CELT', ...) since the AutoOption class handles this)