[PATCH] Use HALFRAD macro instead of hardcoded value

[Siddhesh Poyarekar]

On Wed, Mar 20, 2013 at 10:18:19AM +0100, Ondřej Bílka wrote:
> git grep 8388608.0 also found 
> _rintf.c:  static const float TWO23 = 8388608.0;
> is this coincidence on could we use same macro there?
> 

It's not part of the mp code, which is why I did not change it.

Siddhesh