[FFmpeg-cvslog] Force linking against user32 if dxva2 is enabled.

[compn]

On Tue, 17 Feb 2015 15:17:54 +0100 (CET)
git at videolan.org (Carl Eugen Hoyos) wrote:

> Force linking against user32 if dxva2 is enabled.
>  enabled_all dxva2 dxva2api_cobj CoTaskMemFree &&
> -    prepend ffmpeg_libs $($ldflags_filter "-lole32") &&
> +    prepend ffmpeg_libs $($ldflags_filter "-lole32" "-luser32") &&

<j-b> Why do you need user32?

-compn