Remove -Werror from CFLAGS causing all sorts of havoc due to
deprecated declarations in media-sound/jack-audio-connection-kit
See also: https://bugs.gentoo.org/show_bug.cgi?id=542120

--- sndfile-tools-1.03/configure
+++ sndfile-tools-1.03/configure
@@ -11397,9 +11397,6 @@
 	CFLAGS="$CFLAGS -std=gnu99 -Wall -Wextra -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return -Wcast-align -Wcast-qual -Wnested-externs -Wshadow -Wpointer-arith"
 	# -Wundef -Wbad-function-cast -Wmissing-declarations -Wconversion -Winline"
 
-	if test x$ac_arg_gcc_werror = "xyes" ; then
-		CFLAGS="-Werror $CFLAGS"
-		fi
 
 
 $as_echo "#define COMPILER_IS_GCC 1" >>confdefs.h