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wscript: improve check for ucontext

The ucontext functionality is not available on all CPUs with all C
libraries. Instead of making just assumptions based on the CPU
architecture, this commit adds the necessary checks in wscript to verify
the availability of the ucontext functionality, before using it in
dbus/sigsegv.c.

This avoids the long list of architecture exclusions, and make it more
robust when building jack2 for new CPU architectures.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Don't pack structures on MIPS where unaligned access is not allowed

jack_latency_range_t is

struct _jack_latency_range {
    jack_nframes_t min;
    jack_nframes_t max;
};

and jack_nframes_t is

typedef uint32_t        jack_nframes_t;

so it's unsigned. Initialising it with -1 is invalid (at least in C++14). We cannot use {0, 0}, because latency_cb has

   jack_latency_range_t range;
   range.min = range.max = 0;
   if ((range.min != capture_latency.min) || (range.max !=
       capture_latency.max)) {
       capture_latency = range;
   }

so we must not have {0, 0}, otherwise the condition would never be true.

Using UINT32_MAX should be equivalent to the previous -1.

Space required before macro. No functional changes.

If configured with --clients=512 (translates to CLIENT_NUM), we exceed
the maximum stack size. CLIENT_NUM==500 still works, but let's allocate
the matrix on the heap to be safe.

Kudos to Markus Seeber for the initial bug triage.

Fixes #212

Add support for nios2

When compiling jack on nios2, compilation fails because NGREGS is not
defined. Since this is only for debug output on segmentation faults, stub
the debug print out like it's been done for other platforms before.

Inspired by
d11bb09529

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>

allow to use source date for man page generation

This reverts commit b4e7e875a7.

this enables making reproducible builds of this package

Fix Netjack crashes due to broken alignment

See discussion at http://comments.gmane.org/gmane.comp.audio.jackit/29516

Use ARM neon intrinsics for AudioBufferMixdown

This makes sure header checks work when the third party package is
installed in a non-standard location, as long as a pkg-config file is
found.

It is already defined by conf.define().