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Fixes a denorm problem when the input goes silent after active audio

--- a/celt/arch.h

+++ b/celt/arch.h

@@ -100,6 +100,7 @@

 #define DB_SHIFT 10

 #define EPSILON 1

+#define VERY_SMALL 0

 #define VERY_LARGE16 ((opus_val16)32767)

 #define Q15_ONE ((opus_val16)32767)

@@ -140,6 +141,7 @@

 #define NORM_SCALING 1.f

 #define EPSILON 1e-15f

+#define VERY_SMALL 1e-30f

 #define VERY_LARGE16 1e15f

 #define Q15_ONE ((opus_val16)1.f)

--- a/celt/celt_decoder.c

+++ b/celt/celt_decoder.c

@@ -236,7 +236,7 @@

          /* Shortcut for the standard (non-custom modes) case */

          for (j=0;j<N;j++)

          {

-            celt_sig tmp = x[j] + m;

+            celt_sig tmp = x[j] + m + VERY_SMALL;

             m = MULT16_32_Q15(coef0, tmp);

             y[j*C] = SCALEOUT(SIG2WORD16(tmp));

          }

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -429,10 +429,10 @@

          x = in[channels*i+c];

          /* First stage */

          tmp = x-hp_mem[2*c];

-         hp_mem[2*c] = hp_mem[2*c] + coef*(x - hp_mem[2*c]);

+         hp_mem[2*c] = hp_mem[2*c] + coef*(x - hp_mem[2*c]) + VERY_SMALL;

          /* Second stage */

          y = tmp - hp_mem[2*c+1];

-         hp_mem[2*c+1] = hp_mem[2*c+1] + coef*(tmp - hp_mem[2*c+1]);

+         hp_mem[2*c+1] = hp_mem[2*c+1] + coef*(tmp - hp_mem[2*c+1]) + VERY_SMALL;

          out[channels*i+c] = y;

       }

    }