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Fixes problem with M_PI

--- a/celt/mathops.h

+++ b/celt/mathops.h

@@ -38,6 +38,8 @@

 #include "entcode.h"

 #include "os_support.h"

+#define PI 3.141592653f

+

 /* Multiplies two 16-bit fractional values. Bit-exactness of this macro is important */

 #define FRAC_MUL16(a,b) ((16384+((opus_int32)(opus_int16)(a)*(opus_int16)(b)))>>15)

@@ -48,7 +50,7 @@

 #define cA 0.43157974f

 #define cB 0.67848403f

 #define cC 0.08595542f

-#define cE ((float)M_PI/2)

+#define cE ((float)PI/2)

 static OPUS_INLINE float fast_atan2f(float y, float x) {

    float x2, y2;

    x2 = x*x;

@@ -111,7 +113,6 @@

 #ifndef FIXED_POINT

-#define PI 3.141592653f

 #define celt_sqrt(x) ((float)sqrt(x))

 #define celt_rsqrt(x) (1.f/celt_sqrt(x))

 #define celt_rsqrt_norm(x) (celt_rsqrt(x))