Update libsndfile to 1.0.29pre2+git

This pulls in MANY (over 890) changes compared to our
from our current 1.0.24 version.

lib-src/libsndfile/AUTHORS

@@ -12,3 +12,46 @@ apart from code in the following directories:
    modifications were required to integrate these files into libsndfile. The
    changes are listed in src/G72x/ChangeLog.
 
+
+Others:
+
+    2013-03-07 Michael Pruett
+    2013-02-11 Chris Roberts c.roberts@csrfm.com
+    2012-03-17 IOhannes m zmoelnig
+    2013-02-21 Jan Starry
+    2012-01-20 Bodo
+    2011-06-23 Tim van der Molen
+    2010-12-01 Tim Blechmann
+    2010-10-04 Matti Nykyri
+    2010-09-17 Brian Lewis
+    2010-02-22 Robin Gareus
+    2010-01-07 Christian Weisgerber and Jacob Meuserto
+    2009-10-18 Olivier Tristan
+    2009-10-14, 2009-08-30 Uli Franke
+    2009-06-24, 2008-11-19, 2004-09-22, 2004-06-17, 2003-05-03, 2003-05-02 Conrad Parker
+    2009-05-22 Lennart Poettering
+    2008-07-03, 2006-10-22, 2006-10-18 Fons Adriaensen
+    2008-04-19 David Yeo
+    2008-01-20 Yair K.
+    2007-12-03 Robs
+    2007-07-12 Ed Schouten
+    2007-06-07 Trent Apted
+    2007-04-14, 2003-12-12 André Pang
+    2007-04-14 Reuben Thomas
+    2006-11-09 Jonathan Woithe
+    2006-03-26 Diego 'Flameeyes' Pettenò
+    2006-03-17 Paul Davis
+    2006-03-09 Jesse Chappell
+    2006-01-09, 2005-12-28 John ffitch
+    2005-09-21 David A. van Leeuwen
+    2005-08-15 Mo DeJong
+    2005-04-30 David Viens
+    2004-12-29 Steve Baker
+    2004-09-05 Denis Cote
+    2004-06-28 Stanko Juzbasic
+    2004-02-14 Frank Neumann
+    2003-08-15 Axel Röbel
+    2003-08-06 Peter Miller
+    2003-07-21 Tero Pelander
+    2003-02-10 Antoine Mathys
+    2002-12-30 Marek Peteraj