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fixed-point: real FFT no longer needs float ops when MIXED_PRECISION is enabled.

--- a/libcelt/kiss_fftr.c

+++ b/libcelt/kiss_fftr.c

@@ -23,6 +23,7 @@

 #endif

 #include "os_support.h"

+#include "mathops.h"

 #include "kiss_fftr.h"

 #include "_kiss_fft_guts.h"

@@ -60,7 +61,7 @@

     st->substate->scale *= .5;

 #endif

-#if defined (FIXED_POINT) && !defined(DOUBLE_PRECISION)

+#if defined (FIXED_POINT) && (!defined(DOUBLE_PRECISION) || defined(MIXED_PRECISION))

     for (i=0;i<twiddle_size;++i) {

        celt_word32_t phase = i+(nfft>>1);

        kf_cexp2(st->super_twiddles+i, DIV32(SHL32(phase,16),nfft));