PowerPC floating point little-endian [10 of 15]

http://sourceware.org/ml/libc-alpha/2013-07/msg00201.html

These two functions oddly test x+1>0 when a double x is >= 0.0, and
similarly when x is negative.  I don't see the point of that since the
test should always be true.  I also don't see any need to convert x+1
to integer rather than simply using xr+1.  Note that the standard
allows these functions to return any value when the input is outside
the range of long long, but it's not too hard to prevent xr+1
overflowing so that's what I've done.

(With rounding mode FE_UPWARD, x+1 can be a lot more than what you
might naively expect, but perhaps that situation was covered by the
x - xrf < 1.0 test.)

	* sysdeps/powerpc/fpu/s_llround.c (__llround): Rewrite.
	* sysdeps/powerpc/fpu/s_llroundf.c (__llroundf): Rewrite.

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