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Don't call the libm tanh()

--- a/silk/dred_coding.c

+++ b/silk/dred_coding.c

@@ -37,6 +37,7 @@

 #include "os_support.h"

 #include "dred_config.h"

 #include "dred_coding.h"

+#include "vec.h"

 #define LATENT_DIM 80

 #define STATE_DIM 80

@@ -59,7 +60,7 @@

         int q;

         delta = dzone[i]*(1.f/1024.f);

         xq = x[i]*scale[i]*(1.f/256.f);

-        xq = xq - delta*tanh(xq/(delta+eps));

+        xq = xq - delta*tanh_approx(xq/(delta+eps));

         q = (int)floor(.5f+xq);

         /* Make the impossible actually impossible. */

         if (r[i] == 0 || p0[i] >= 32767) q = 0;

-- 

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