[PATCH] Fix nextafterf

[Jie Zhang]

Currently nextafterf in uClibc is just a wrapper of nextafter, which is 
a double version. But this is not correct. Below is a test case:

#include <stdio.h>
#include <math.h>
int main ()
{
float a = 75563.570, b;
b = nextafterf (a, -0.0);
printf ("a = %f, b = %f\n", a, b);
return 0;
}

Run it on AMD64 with glibc:
a = 75563.570312, b = 75563.562500

Run it on Blackfin with uClibc:
a = 75563.570313, b = 75563.570313

A patch is attached. This patch copies nextafterf from glibc. Tested on 
Blackfin with the above test case. If it's OK, please apply. Thanks.


Jie
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