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sp_fft: undeclared log2 fixes

--- a/lib/fft/fftlib.c

+++ b/lib/fft/fftlib.c

@@ -9,6 +9,8 @@

 #define M_PI 3.14159265358979323846

 #endif

+#define LOG2(n) (log(n) / log(2))

+

 #define POW2(m) ((uint32_t) 1 << (m))       /* integer power of 2 for m<32 */

 /* fft's with M bigger than this bust primary cache */

--- a/lib/fft/sp_fft.c

+++ b/lib/fft/sp_fft.c

@@ -26,13 +26,13 @@

 void sp_fftr(sp_fft *fft, SPFLOAT *buf, int FFTsize)

 {

-    int M = log2(FFTsize);

+    int M = LOG2(FFTsize);

     rffts1(buf, M, fft->utbl, fft->BRLow);

 }

 void sp_fft_cpx(sp_fft *fft, SPFLOAT *buf, int FFTsize)

 {

-    int M = log2(FFTsize);

+    int M = LOG2(FFTsize);

     ffts1(buf, M, fft->utbl, fft->BRLowCpx);

 }

@@ -40,7 +40,7 @@

 void sp_ifftr(sp_fft *fft, SPFLOAT *buf, int FFTsize)

 {

-    int M = log2(FFTsize);

+    int M = LOG2(FFTsize);

     riffts1(buf, M, fft->utbl, fft->BRLow);

 }