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_sin.c

@@ -15,10 +15,10 @@
  * kernel sin function on [-pi/4, pi/4], pi/4 ~ 0.7854
  * Input x is assumed to be bounded by ~pi/4 in magnitude.
  * Input y is the tail of x.
- * Input iy indicates whether y is 0. (if iy=0, y assume to be 0). 
+ * Input iy indicates whether y is 0. (if iy=0, y assume to be 0).
  *
  * Algorithm
- *	1. Since sin(-x) = -sin(x), we need only to consider positive x. 
+ *	1. Since sin(-x) = -sin(x), we need only to consider positive x.
  *	2. if x < 2^-27 (hx<0x3e400000 0), return x with inexact if x!=0.
  *	3. sin(x) is approximated by a polynomial of degree 13 on
  *	   [0,pi/4]
@@ -26,13 +26,13 @@
  *	   	sin(x) ~ x + S1*x + ... + S6*x
  *	   where
  *	
- * 	|sin(x)         2     4     6     8     10     12  |     -58
- * 	|----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x  +S6*x   )| <= 2
- * 	|  x 					           | 
- * 
+ *	|sin(x)         2     4     6     8     10     12  |     -58
+ *	|----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x  +S6*x   )| <= 2
+ *	|  x 					           |
+ *
  *	4. sin(x+y) = sin(x) + sin'(x')*y
  *		    ~ sin(x) + (1-x*x/2)*y
- *	   For better accuracy, let 
+ *	   For better accuracy, let
  *		     3      2      2      2      2
  *		r = x *(S2+x *(S3+x *(S4+x *(S5+x *S6))))
  *	   then                   3    2
@@ -41,11 +41,7 @@
 
 #include "fdlibm.h"
 
-#ifdef __STDC__
-static const double 
-#else
-static double 
-#endif
+static const double
 half =  5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
 S1  = -1.66666666666666324348e-01, /* 0xBFC55555, 0x55555549 */
 S2  =  8.33333333332248946124e-03, /* 0x3F811111, 0x1110F8A6 */
@@ -54,12 +50,7 @@ S4  =  2.75573137070700676789e-06, /* 0x3EC71DE3, 0x57B1FE7D */
 S5  = -2.50507602534068634195e-08, /* 0xBE5AE5E6, 0x8A2B9CEB */
 S6  =  1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */
 
-#ifdef __STDC__
-	double __kernel_sin(double x, double y, int iy)
-#else
-	double __kernel_sin(x, y, iy)
-	double x,y; int iy;		/* iy=0 if y is zero */
-#endif
+double __kernel_sin(double x, double y, int iy)
 {
 	double z,r,v;
 	int ix;