Add additional math constants

Add math constants which are defined in libc math.h but not ours.
Keep constants in rs_types.rsh instead of rs_math.rsh to avoid
problems with including rs_math.rsh in other projects (namely
libbcc).

Change-Id: Ia67f501353ac6e2311549bef6767e2b182f70132
diff --git a/scriptc/rs_types.rsh b/scriptc/rs_types.rsh
index 04099cd..5c99313 100644
--- a/scriptc/rs_types.rsh
+++ b/scriptc/rs_types.rsh
@@ -41,7 +41,20 @@
 #ifndef __RS_TYPES_RSH__
 #define __RS_TYPES_RSH__
 
-#define M_PI        3.14159265358979323846264338327950288f   /* pi */
+/* Constants */
+#define M_E         2.718281828459045235360287471352662498f     /* e */
+#define M_LOG2E     1.442695040888963407359924681001892137f     /* log_2 e */
+#define M_LOG10E    0.434294481903251827651128918916605082f     /* log_10 e */
+#define M_LN2       0.693147180559945309417232121458176568f     /* log_e 2 */
+#define M_LN10      2.302585092994045684017991454684364208f     /* log_e 10 */
+#define M_PI        3.141592653589793238462643383279502884f     /* pi */
+#define M_PI_2      1.570796326794896619231321691639751442f     /* pi/2 */
+#define M_PI_4      0.785398163397448309615660845819875721f     /* pi/4 */
+#define M_1_PI      0.318309886183790671537767526745028724f     /* 1/pi */
+#define M_2_PIl     0.636619772367581343075535053490057448f     /* 2/pi */
+#define M_2_SQRTPI  1.128379167095512573896158903121545172f     /* 2/sqrt(pi) */
+#define M_SQRT2     1.414213562373095048801688724209698079f     /* sqrt(2) */
+#define M_SQRT1_2   0.707106781186547524400844362104849039f     /* 1/sqrt(2) */
 
 #include "stdbool.h"
 /**