d3dx9: Replace M_PI by its D3DX equivalent

[Alexandre Julliard]

Nozomi Kodama <nozomi.kodama at yahoo.com> writes:

> What is the problem with patch:
> http://source.winehq.org/patches/data/97500
>
> M_PI is never used in D3DX (moreover it is deprecated in C99)

It's used all over the place, and we have portability macros for
it. There's no reason to avoid it.

-- 
Alexandre Julliard
julliard at winehq.org