Alternate approach to turn on freetype in Fuchsia.

What do you think of this?  It's basically what you wrote, factored differently.

Flipping on skia_use_freetype will enable the SkFontHost_Freetype*.cpp files
via the :typeface_freetype target.

Then we just pull out the SkFontMgr Fuchsia wants to use into its own little
:fontmgr_fuchsia target.  No major difference here, except the availability
of freetype headers, etc, is a bit more tightly scoped to just those that
need them.

We (obviously?) don't have Fuchsia builders, so I've got to rely on you for sanity testing this.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2333913002

Review-Url: https://codereview.chromium.org/2333913002
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