Missing modfl with patch

[MrSunshine]

modfl is missing in haikus glibc

source from

​http://glibc.sourcearchive.com/documentation/2.9-9ubuntu2/sysdeps_2ieee754_2ldbl-96_2s__modfl_8c-source.html

[MrSunshine]

Patch to add modfl to haiku libroot.so

[MrSunshine]

tested using

#include <stdio.h>
#include <math.h>

int main()
{
	long double d = 6.242341512321321;

	long double intPart;
	long double doublePart = modfl(d, &intPart);

	printf("double: %.15Lf\n", d);
	printf("doublePart: %.15Lf, intPart: %.15Lf\n", doublePart, intPart);
}

gives same result on haiku gcc2 and gcc4 as it does in linux, do not know how much more i can test it? :)

[zooey]

Applied in hrev37904, thanks.