cairo-quartz-font.c: Non-public CGFontGetGlyphPath now deprecated

Since upgrading to OS X 10.10 I am now receiving deprecation warnings on 
running cairo applications:

Jun 19 15:39:28 Simons-MacBook-Pro.local lua[74495] <Error>: The function 
‘CGFontGetGlyphPath’ is obsolete and will be removed in an upcoming update. 
Unfortunately, this application, or a library it uses, is using this obsolete 
function, and is thereby contributing to an overall degradation of system 
performance.

Jun 19 15:39:28 Simons-MacBook-Pro.local lua[74495] <Error>: The function 
‘CGFontGetGlyphPaths’ is obsolete and will be removed in an upcoming update. 
Unfortunately, this application, or a library it uses, is using this obsolete 
function, and is thereby contributing to an overall degradation of system 
performance.

I am guessing that the official way to do things is to move to Core Text and 
CTFontCreatePathForGlyph. This doesn't look like it would be too difficult to 
do, since most of the CG... functions being used in cairo-quartz-font.c appear 
to be available in Core Text, but in reality I have no experience with these 
APIs and hence no actual idea what I am talking about.
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