[cairo] Export FreeType synthesis options

[SeongWon Cho]

Hi, all

Cairo patch 2587b9d gave us the functionality to use Freetype's synthesis options.
http://cgit.freedesktop.org/cairo/commit/?id=2587b9dfd391fc1dc6e20eaa4c2d64fafe2e809b

But we can't set the weight of embolden as Cairo doesn't use FT_Outline_Embolden()  but  FT_GlyphSlot_Embolden()
How do you think to support FT_Outline_Embolden() in Cairo?

Thank you.


 조 성 원 선임/ SeongWon Cho
    SLP R&D Group

   Mobile Device Division.
   Telecommunication Network
   Samsung Electronics Co. Ltd.
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   Mail : seongwon1.cho at samsung.com