[cairo] "export" annotations on public APIs

[Robert O'Callahan]

Integrating Cairo into Mozilla, we've run into a problem building Cairo as a 
shared library --- there are no annotations to indicate which functions 
should be exported from a shared library, when building on a platform that 
doesn't export all symbols by default. This affects not only Win32, but now 
also gcc4 when we use "#pragma GCC visibility" to hide internal symbols. 
Would a patch that adds a CAIRO_EXPORT macro to all public functions (by 
default, defined to nothing) be looked upon favourably?

Rob
-- 
["Therefore, my dear friends, as you have always obeyed–not only in my
presence, but now much more in my absence–continue to work out your
salvation with fear and trembling, for it is God who works in you to will
and to act according to his good purpose." Philippians 2:12-13.]
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