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C89 friendliness

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -1289,6 +1289,7 @@

       float exc[MAX_PERIOD];

       float ac[LPC_ORDER+1];

       float decay = 1;

+      float S1=0;

       celt_word32 mem[LPC_ORDER]={0};

       offset = MAX_PERIOD-pitch_index;

@@ -1331,7 +1332,6 @@

             decay = 1;

       }

-      float S1=0;

       /* Copy excitation, taking decay into account */

       for (i=0;i<len+st->mode->overlap;i++)

       {