[cairo] Repost [PATCH cairo-www] Missing argument defs cause segfaults

Lawrence D'Oliveiro ldo at geek-central.gen.nz
Wed May 17 04:59:43 UTC 2017

The cookbook example of how to call FreeType using ctypes is missing
the argtypes definition for cairo_font_face_get_user_data. This will
cause segfaults.

Enclosed is a fix.
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