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Varlength arrays fix for C89

--- a/libcelt/plc.c

+++ b/libcelt/plc.c

@@ -106,7 +106,9 @@

 {

    float d;

    int i;

-   float xx[n];

+   VARDECL(float, xx);

+   SAVE_STACK;

+   ALLOC(xx, n, float);

    for (i=0;i<n;i++)

       xx[i] = x[i];

    for (i=0;i<overlap;i++)

@@ -122,4 +124,5 @@

       lag--;

    }

    ac[0] += 10;

+   RESTORE_STACK;

 }