Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/webrtc/common_audio/signal_processing/spl_version.c

@@ -0,0 +1,25 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_get_version().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include <string.h>
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+int16_t WebRtcSpl_get_version(char* version, int16_t length_in_bytes)
+{
+    strncpy(version, "1.2.0", length_in_bytes);
+    return 0;
+}