remove junk sincos implementations in preparation to merge nsz's real ones

include/math.h

@@ -382,9 +382,6 @@ long double ynl(int, long double);
 double      scalb(double, double);
 float       scalbf(float, float);
 long double scalbl(long double, long double);
-void sincosf(float, float *, float *);
-void sincos(double, double *, double *);
-void sincosl(long double, long double *, long double *);
 #endif
 
 #ifdef __cplusplus

src/linux/sincos.c

-#define _GNU_SOURCE
-#include <math.h>
-
-void sincos(double t, double *y, double *x)
-{
-	*y = sin(t);
-	*x = cos(t);
-}

src/linux/sincosf.c

-#define _GNU_SOURCE
-#include <math.h>
-
-void sincosf(float t, float *y, float *x)
-{
-	*y = sinf(t);
-	*x = cosf(t);
-}

src/linux/sincosl.c

-#define _GNU_SOURCE
-#include <math.h>
-
-void sincosl(long double t, long double *y, long double *x)
-{
-	*y = sinl(t);
-	*x = cosl(t);
-}