OS X apparently doesn't support \W.

Thanks-to: Peter Olsson <peter.olsson@visionutveckling.se>

FS-4528 --resolve

Tell people where to go to get the repository for building the
freeswitch-sounds-* and freeswitch-music-* Debian packages, as well as
what to read when they get there.

After chasing down a few memory leaks that two of which were in the freeradius library, the result is more standardized memory cleanup.

Enhancements to trace logging, include threads and context ID.

Changed default opal_conf.xml to allow more than just G.711 uLaw and not to clutter log file with debug logs.

Added to opal_conf.xml item for "disable-transcoding".

Updated build/buildopal.sh to use correct ./configure items for PTLib, allow for something other than standard install directory for PTLib/OPAL and be able to easily bind to a specific release of PTLib/OPAL.

Adding functionality to mod_xml_radius. Now you can do conditional accounting. And you can pull values from the other leg, specify an alternate variable name in case the variable doesn't exist and you can have default values.

Callbacks are invoked from ftdm_span_start/_stop().
I/O is started before SIG and shut down in reverse order.

This is needed for ftmod_misdn, to move the mISDN message handling
into a separate thread (solving the mISDN socket vs. FreeTDM API issues).

With these callbacks, the I/O thread can be started after the span I/O configuration
has been (successfully) completed and stopped before destroying the span.

NOTE: Both SIG and I/O callbacks are called with the span mutex locked,
so threads created or destroyed synchronously in either of the custom
start/stop functions, can not use ftdm_span_*() functions that lock
the span mutex (e.g. ftdm_span_get_channel_count()).
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

The --enable-builtin-tiff option appends libs/tiff-3.8.2/libtiff/libtiff.la
to LIBS, causing the AC_CHECK_LIB([jpeg]...) check to fail, because
libtiff.la does not exist at configure time.

Temporarily store tiff and jpeg libs in TIFF_-/JPEG_LIBS variables and
append them to LIBS after all library checks have run.

Example error output:
    configure:20049: checking for jpeg_start_compress in -ljpeg
    configure:20074: cc -o conftest -O2 -pipe -fno-strict-aliasing    -L/usr/local/lib conftest.c -ljpeg  -lm  /usr/home/ports/net/freeswitch-core-devel/work/freeswitch-1.2.1/libs/tiff-3.8.2/libtiff/libtiff.la >&5
    cc: /usr/home/ports/net/freeswitch-core-devel/work/freeswitch-1.2.1/libs/tiff-3.8.2/libtiff/libtiff.la: No such file or directory
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

Fix rtp payload number and possibly other params, since we ALWAYS use PCMU all params should be hardcoded

FreeSWITCH: Add WIN32 strerror_s() variant to custom switch_strerror_r() helper function and fix more strerror_r() users.

Convert mod_xml_cdr, mod_json_cdr and mod_conference to the new function.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

GNU variant of strerror_r() returns char *, while the XSI version returns int.

To make things worse, glibc ships both and added a unused result warning
in recent versions (2.16) causing the build to fail.

Add our own custom wrapper that always returns a pointer to the message buffer
and additionally make XSI versions of strerror_r() GNU compatible by
returning "Unknown error xxx" if no error message is available.

Fixes:
    src/switch_rtp.c: In function 'rtp_common_read':
    src/switch_rtp.c:3313:15: error: ignoring return value of 'strerror_r',
    declared with attribute warn_unused_result [-Werror=unused-result]
    cc1: all warnings being treated as errors
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>