Add freetype 2.8.1 patch

[MarshallOfSound]

Fixes #384

[MarshallOfSound]

@alexeykuzmin When this is merged it can be deleted in the chromium 61 branch (this patch is in chromium 61+)

[alexeykuzmin]

@MarshallOfSound 👍

[alexeykuzmin]

@MarshallOfSound Should it be merged? All the checks seem to be fine.

[MarshallOfSound]

@alexeykuzmin Yeah, if someone approves all 3 PR's we can merge them in 👍

[ckerr]

Looks fine to me, but do we have a preferred way -- eg filing open issues -- of leaving breadcrumbs to remind us to remove this-or-that patch when we get an upstream fix?

[alexeykuzmin]

@ckerr If a patch just backports something from a newer version as is,
it will simply fail when we try to apply it to that version. It actually happens almost every Chromium and Node.js upgrade.
But if a patch is a temporary workaround, I would prefer to have an open issue to remove it when it's no longer needed.