libm: Fixed signature mismatches for __ieee754_rem_pio2 and __kernel_rem_pio2.

Fixes Bugzilla #4201.

src/libm/k_rem_pio2.c

@@ -147,7 +147,7 @@ one    = 1.0,
 two24   =  1.67772160000000000000e+07, /* 0x41700000, 0x00000000 */
 twon24  =  5.96046447753906250000e-08; /* 0x3E700000, 0x00000000 */
 
-int attribute_hidden __kernel_rem_pio2(double *x, double *y, int e0, int nx, int prec, const int32_t *ipio2)
+int32_t attribute_hidden __kernel_rem_pio2(double *x, double *y, int e0, int nx, int prec, const int32_t *ipio2)
 {
 	int32_t jz,jx,jv,jp,jk,carry,n,iq[20],i,j,k,m,q0,ih;
 	double z,fw,f[20],fq[20],q[20];

src/libm/math_private.h

@@ -206,7 +206,7 @@ __ieee754_sqrt(double)
      extern double __ieee754_jn(int, double) attribute_hidden;
      extern double __ieee754_yn(int, double) attribute_hidden;
      extern double __ieee754_remainder(double, double) attribute_hidden;
-     extern int __ieee754_rem_pio2(double, double *) attribute_hidden;
+     extern int32_t __ieee754_rem_pio2(double, double *) attribute_hidden;
 #if defined(_SCALB_INT)
      extern double __ieee754_scalb(double, int) attribute_hidden;
 #else
@@ -220,7 +220,7 @@ __ieee754_sqrt(double)
      extern double __kernel_sin(double, double, int) attribute_hidden;
      extern double __kernel_cos(double, double) attribute_hidden;
      extern double __kernel_tan(double, double, int) attribute_hidden;
-     extern int __kernel_rem_pio2(double *, double *, int, int, int,
-                                  const int *) attribute_hidden;
+     extern int32_t __kernel_rem_pio2(double *, double *, int, int, int,
+                                  const int32_t *) attribute_hidden;
 
 #endif /* _MATH_PRIVATE_H_ */