Add copy of opus library in deps/third_party.

opus/silk/fixed/regularize_correlations_FIX.c

+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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+modification, are permitted provided that the following conditions
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+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main_FIX.h"
+
+/* Add noise to matrix diagonal */
+void silk_regularize_correlations_FIX(
+    opus_int32                      *XX,                                    /* I/O  Correlation matrices                                                        */
+    opus_int32                      *xx,                                    /* I/O  Correlation values                                                          */
+    opus_int32                      noise,                                  /* I    Noise to add                                                                */
+    opus_int                        D                                       /* I    Dimension of XX                                                             */
+)
+{
+    opus_int i;
+    for( i = 0; i < D; i++ ) {
+        matrix_ptr( &XX[ 0 ], i, i, D ) = silk_ADD32( matrix_ptr( &XX[ 0 ], i, i, D ), noise );
+    }
+    xx[ 0 ] += noise;
+}