Specialize fdlibm to jerry

Keep IEEE code paths only:
* removed SVID, XOPEN, POSIX code paths from everywhere.
* deleted s_lib_version.c, as version is only useful if multiple
  standards are supported.
* deleted k_standard.c, as it handles non-IEEE exception cases only.
* renamed the e_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c sources as
  s_.*, dropped the __ieee754_ prefix from the names of the
  appropriate functions therein, and deleted the
  w_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c wrapper code.

Keep C99 declaration variants only:
* removed old C-style function declaration variants.
* removed data declaration variants where const qualifier was not
  used.

Clean unused sources/functions:
* removed s_{rint,significand,tanh}.c and the appropriate functions
  defined therein.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

third-party/fdlibm/k_cos.c

@@ -15,7 +15,7 @@
  * __kernel_cos( x,  y )
  * kernel cos function on [-pi/4, pi/4], pi/4 ~ 0.785398164
  * Input x is assumed to be bounded by ~pi/4 in magnitude.
- * Input y is the tail of x. 
+ * Input y is the tail of x.
  *
  * Algorithm
  *	1. Since cos(-x) = cos(x), we need only to consider positive x.
@@ -26,14 +26,14 @@
  *	   	cos(x) ~ 1 - x*x/2 + C1*x + ... + C6*x
  *	   where the remez error is
  *	
- * 	|              2     4     6     8     10    12     14 |     -58
- * 	|cos(x)-(1-.5*x +C1*x +C2*x +C3*x +C4*x +C5*x  +C6*x  )| <= 2
- * 	|    					               | 
- * 
- * 	               4     6     8     10    12     14 
+ *	|              2     4     6     8     10    12     14 |     -58
+ *	|cos(x)-(1-.5*x +C1*x +C2*x +C3*x +C4*x +C5*x  +C6*x  )| <= 2
+ *	|    					               |
+ *
+ *	               4     6     8     10    12     14
  *	4. let r = C1*x +C2*x +C3*x +C4*x +C5*x  +C6*x  , then
  *	       cos(x) = 1 - x*x/2 + r
- *	   since cos(x+y) ~ cos(x) - sin(x)*y 
+ *	   since cos(x+y) ~ cos(x) - sin(x)*y
  *			  ~ cos(x) - x*y,
  *	   a correction term is necessary in cos(x) and hence
  *		cos(x+y) = 1 - (x*x/2 - (r - x*y))
@@ -48,11 +48,7 @@
 
 #include "fdlibm.h"
 
-#ifdef __STDC__
-static const double 
-#else
-static double 
-#endif
+static const double
 one =  1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
 C1  =  4.16666666666666019037e-02, /* 0x3FA55555, 0x5555554C */
 C2  = -1.38888888888741095749e-03, /* 0xBF56C16C, 0x16C15177 */
@@ -61,12 +57,7 @@ C4  = -2.75573143513906633035e-07, /* 0xBE927E4F, 0x809C52AD */
 C5  =  2.08757232129817482790e-09, /* 0x3E21EE9E, 0xBDB4B1C4 */
 C6  = -1.13596475577881948265e-11; /* 0xBDA8FAE9, 0xBE8838D4 */
 
-#ifdef __STDC__
-	double __kernel_cos(double x, double y)
-#else
-	double __kernel_cos(x, y)
-	double x,y;
-#endif
+double __kernel_cos(double x, double y)
 {
 	double a,hz,z,r,qx;
 	int ix;
@@ -76,7 +67,7 @@ C6  = -1.13596475577881948265e-11; /* 0xBDA8FAE9, 0xBE8838D4 */
 	}
 	z  = x*x;
 	r  = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*C6)))));
-	if(ix < 0x3FD33333) 			/* if |x| < 0.3 */ 
+	if(ix < 0x3FD33333) 			/* if |x| < 0.3 */
 	    return one - (0.5*z - (z*r - x*y));
 	else {
 	    if(ix > 0x3fe90000) {		/* x > 0.78125 */