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/Scripts/git-pre-commit-hook

@@ -0,0 +1,84 @@
+#!/bin/sh
+
+if git rev-parse --verify HEAD >/dev/null 2>&1 ; then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
+	fi
+
+# Redirect output to stderr.
+exec 1>&2
+
+#-------------------------------------------------------------------------------
+# Prevent files with non-ascii filenames from being committed.
+
+if test $(git diff --cached --name-only --diff-filter=A -z $against | LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0 ; then
+	echo "Error: Attempt to add a non-ascii file name."
+	echo
+	echo "This can cause problems if you want to work"
+	echo "with people on other platforms."
+	echo
+	echo "To be portable it is advisable to rename the file ..."
+	echo
+	echo "Commit aborted."
+	exit 1
+	fi
+
+#-------------------------------------------------------------------------------
+# Check the formatting of all C files.
+
+# http://man.openbsd.org/sed#r
+# http://man.openbsd.org/sed#E
+# http://netbsd.gw.com/cgi-bin/man-cgi?sed++NetBSD-current
+# https://github.com/freebsd/freebsd/blob/master/usr.bin/sed/main.c
+# http://git.savannah.gnu.org/gitweb/?p=sed.git;a=blob;f=sed/sed.c
+# GNU has -r and -E (undocumented); MacOS has -E but not -r; Sunos has neither.
+files=$(git diff-index --name-status --cached HEAD | grep -v ^D | sed -E "s/^[A-Z]+[A-Z0-9]*[ \t]+/ /")
+
+cfiles=""
+for f in $files ; do
+	if test `dirname $f` = "src/ALAC" ; then
+		echo "Skipping cstyle checking on $f"
+	elif test `echo $f | grep -c "\.[ch]$"` -gt 0 ; then
+		cfiles="$cfiles $f"
+		fi
+	done
+
+if test -n "$cfiles" ; then
+	Scripts/cstyle.py $cfiles
+	if test $? -ne 0 ; then
+		echo
+		echo "Commit aborted. Fix the above error before trying again."
+		exit 1
+		fi
+	fi
+
+#-------------------------------------------------------------------------------
+# Check the copyright notice of all files to be commited.
+
+user=`git config --global user.email`
+year=`date +"%Y"`
+
+missing_copyright_year=""
+if test $user = "erikd@mega-nerd.com" ; then
+	for f in $files ; do
+		if test `head -5 $f | grep -i copyright | grep -c -i $user` -gt 0 ; then
+			user_copyright=`grep -i copyright $f | grep $user | grep -c $year`
+			if test $user_copyright -lt 1 ; then
+				missing_copyright_year="$missing_copyright_year $f"
+				fi
+			fi
+		done
+	fi
+
+if test -n "$missing_copyright_year" ; then
+	echo "Missing current year in the copyright notice of the following files:"
+	for f in $missing_copyright_year ; do
+		echo "    $f"
+		done
+	echo "Commit aborted."
+	exit 1
+	fi
+
+exit 0