[Libva] [PATCH] va.h: fix compile warning

[Xiang, Haihao]

> On 21 November 2016 at 15:25, Xiang, Haihao <haihao.xiang at intel.com>
> wrote:
> > Although taking unspecified arguments is obsolete, I don't see any
> > failure caused by ' typedef int (*VAPrivFunc)()'
> > Which compiler are you using, could you provide more info in the
> > commit log?
> > 
> Add "-pedantic" and you'll see a warning on pretty much any version
> of GCC.
> 

Thanks, Emil. I see lots of warning with -pedantic.

> -Emil