[cairo] Implement a fallback for lcd filtering for the freetype backend.

[Lance Hepler]

Hello Gentlemen,

For those of you not following Freedesktop bug
10301<http://bugs.freedesktop.org/show_bug.cgi?id=10301>,
it involves cairo's use of Freetype's lcd filtering abilities, which are
considered by some to be better than cairo's old built-in lcd filtering.

Attached here and to that bug is a patch that sits on top of a revert of
commit 5d887ad5dca5af0f8216830d1b04d08a5aba9bee (which reverted freetype
lcd_filtering from cairo).

Comments for changes to these patches are more than welcome (I need to
spruce up my C a bit).

I would also like some assistance on a different project: bringing freetype
autohinting-derived lsb/rsb deltas into cairo.  A demonstration by David
Turner is here<http://www.mail-archive.com/freetype-devel@nongnu.org/msg01846.html>
.
While we already have excellent text rasterization, I do think we still lag
a little bit behind the commercial sector.  If we can one day match Adobe in
text technology, well that's just a win for free software everywhere.

Thanks again,

Nicolaus L Hepler
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