[cairo][rcairo] Patch for get_font_options, typo in constants

[Ilmari Heikkinen]

Hi, 

First, thanks for the excellent work on rcairo!

Here's a patch for Cairo::Context / Surface.new.font_options segfaulting
in rcairo. Also fixed ANTIALIAS_NONO to ANTIALIAS_NONE.

Reason for the segfault was that cairo_get_font_options copies the
struct from the cairo object instead of returning a pointer to it. 

So the way to change font options in rcairo is:

  fo = context.font_options
  fo.change_things
  context.font_options = fo
  
It doesn't really fit in with the Ruby Way of everything's a reference
(context.font_options.change_things)... font_options reader name could
be changed to something that says that it returns a copy, maybe.


Cheers,
 Ilmari Heikkinen


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