[Fontconfig] fixes in 2.13

[Lawrence D'Oliveiro]

On Thu, 1 Mar 2018 18:20:19 -0600, Kurt Kartaltepe wrote:

> If this hasnt been resolved since 2.12.93, this patches an
> initialization that fails to compile in MSVC which gcc allows.

> -    FT_Pos         advances[3] = {};
> +    FT_Pos         advances[3] = {0};

Looks like for once Microsoft is conforming to the spec
<http://www.open-std.org/JTC1/SC22/WG14/www/docs/n869/>. According to
section 6.7.8, an empty initializer list is not allowed.