fix incorrect long double parameters on arm (and other future ports)

this was the cause of crashes in printf when attempting to print
floating point values.

arch/arm/bits/float.h

 #define FLT_ROUNDS 1
-#define FLT_EVAL_METHOD 2
+#define FLT_EVAL_METHOD 0
 
-#define LDBL_MIN     3.3621031431120935063e-4932L
-#define LDBL_MAX     1.1897314953572317650e+4932L
-#define LDBL_EPSILON 1.0842021724855044340e-19L
+#define LDBL_MIN 2.2250738585072014e-308
+#define LDBL_MAX 1.7976931348623157e+308
+#define LDBL_EPSILON 2.2204460492503131e-16
 
-#define LDBL_MANT_DIG 64
-#define LDBL_MIN_EXP (-16381)
-#define LDBL_MAX_EXP 16384
+#define LDBL_MANT_DIG 53
+#define LDBL_MIN_EXP (-1021)
+#define LDBL_MAX_EXP 1024
 
-#define LDBL_DIG 18
-#define LDBL_MIN_10_EXP (-4931)
-#define LDBL_MAX_10_EXP 4932
+#define LDBL_DIG 15
+#define LDBL_MIN_10_EXP (-307)
+#define LDBL_MAX_10_EXP 308

src/stdlib/frexpl.c

 #include <math.h>
 #include <inttypes.h>
+#include <float.h>
+
+#if LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
 
 /* This version is for 80-bit little endian long double */
 
@@ -23,3 +26,12 @@ long double frexpl(long double x, int *e)
 	y.hw[4] |= 0x3ffe;
 	return y.ld;
 }
+
+#else
+
+long double frexpl(long double x, int *e)
+{
+	return frexp(x, e);
+}
+
+#endif