Bundled build with `freetype` doesn't actually work

[waywardmonkeys]

When we build with --features bundled, we need to add this to the harfbuzz-sys/build.rs:

if cfg!(feature = "freetype") {
    cfg.define("HAVE_FREETYPE", "1");
}

Unfortunately, this will fail as we need to set up additional build flags for the build to find freetype (and this is even more unfriendly on Windows).

This gets a bit annoying when freetype is in the default features ...

[mrobinson]

Maybe for now we can say that Windows only supports directwrite and not freetype?

[waywardmonkeys]

Let me look at this tomorrow and see if I remember what direction I was thinking. I suspect that not having these as default features would be good.

[waywardmonkeys]

(Since I don’t think Servo actually used the platform stuff…)