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Fixed an old issue where the fixed-point MDCT twiddles were stored as 32-bit values

--- a/libcelt/kiss_fft.h

+++ b/libcelt/kiss_fft.h

@@ -55,7 +55,7 @@

 #ifdef DOUBLE_PRECISION

 #  define kiss_fft_scalar celt_int32

-#  define kiss_twiddle_scalar celt_int32

+#  define kiss_twiddle_scalar celt_int16

 #  define KF_SUFFIX _celt_double

 #else

 #  define kiss_fft_scalar celt_int16

--- a/libcelt/mdct.c

+++ b/libcelt/mdct.c

@@ -162,7 +162,7 @@

    /* Pre-rotation */

    {

       kiss_fft_scalar * restrict yp = out;

-      const kiss_fft_scalar *t = &l->trig[0];

+      const kiss_twiddle_scalar *t = &l->trig[0];

       for(i=0;i<N4;i++)

       {

          kiss_fft_scalar re, im, yr, yi;

@@ -185,7 +185,7 @@

       const kiss_fft_scalar * restrict fp = f;

       kiss_fft_scalar * restrict yp1 = out;

       kiss_fft_scalar * restrict yp2 = out+N2-1;

-      const kiss_fft_scalar *t = &l->trig[0];

+      const kiss_twiddle_scalar *t = &l->trig[0];

       /* Temp pointers to make it really clear to the compiler what we're doing */

       for(i=0;i<N4;i++)

       {

@@ -231,7 +231,7 @@

       const kiss_fft_scalar * restrict xp1 = in;

       const kiss_fft_scalar * restrict xp2 = in+N2-1;

       kiss_fft_scalar * restrict yp = f2;

-      const kiss_fft_scalar *t = &l->trig[0];

+      const kiss_twiddle_scalar *t = &l->trig[0];

       for(i=0;i<N4;i++) 

       {

          kiss_fft_scalar yr, yi;

@@ -251,7 +251,7 @@

    /* Post-rotate */

    {

       kiss_fft_scalar * restrict fp = f;

-      const kiss_fft_scalar *t = &l->trig[0];

+      const kiss_twiddle_scalar *t = &l->trig[0];

       for(i=0;i<N4;i++)

       {