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math: add INFINITY and NAN

--- a/include/npe/math.h

+++ b/include/npe/math.h

@@ -5,6 +5,12 @@

 #define M_PI 3.14159265358979323846

+float npe_infinity(void);

+#define INFINITY (npe_infinity())

+

+float npe_nan(void);

+#define NAN (npe_nan())

+

 #define isnan isNaN

 #define acosf acos

--- a/libnpe/_npe.c

+++ b/libnpe/_npe.c

@@ -86,3 +86,23 @@

 	return 0;

 }

+

+float

+npe_infinity(void)

+{

+	union {float f; u32int i;} u;

+

+	u.i = 0x7f800000;

+

+	return u.f;

+}

+

+float

+npe_nan(void)

+{

+	union {float f; u32int i;} u;

+

+	u.i = 0x7fbfffff;

+

+	return u.f;

+}