[cairo] conditionals for older freetype2 without color font feature

[suzuki toshiya]

Hi,

FT_HAS_COLOR() macro is unavailable in older freetype2
without color font feature. attached is a quick fix.

or, something like

#ifndef FT_HAS_COLOR
# define FT_HAS_COLOR(x) ( 0 )
#endif

in config header is better?

--

it seems that fontconfig decided to drop old freetype2,
but I wish if cairo can provide (limited) support for
older freetype2.

Regards,
mpsuzuki
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