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log2/log2f: use huge number according to the type

--- a/libnpe/_npe.h

+++ b/libnpe/_npe.h

@@ -2,6 +2,10 @@

 	Nsec = 1000000000ULL,

 };

+#define ln2o1 1.4426950408889634073599

+#define hugeF 3.4028234e+38

+#define hugeD 1.79769313486231e+308

+

 uvlong npe_nanosec(void);

 void npe_nsleep(uvlong ns);

 int npe_mkdirp(char *s, int perm);

--- a/libnpe/exp2.c

+++ b/libnpe/exp2.c

@@ -1,6 +1,5 @@

 #include <math.h>

-

-#define ln2o1 1.4426950408889634073599

+#include "_npe.h"

 double

 exp2(double x)

--- a/libnpe/log2.c

+++ b/libnpe/log2.c

@@ -1,15 +1,22 @@

 #include <math.h>

+#include "_npe.h"

-#define ln2o1 1.4426950408889634073599

-#define huge 1.79769313486231e+308

-

 double

 log2(double x)

 {

 	if(x == 0)

-		return -huge;

+		return -hugeD;

 	if(x < 0 || isNaN(x))

 		return NaN();

 	return log(x)*ln2o1;

+}

+

+float

+log2f(float x)

+{

+	if(x == 0)

+		return -hugeF;

+

+	return log2(x);

 }