[cairo] Patch for fixing compilation of perf/

[Antoine Azar]

Hey guys,

here's a patch that should solve any Windows developer's issues of 
building the perf/ code. I also modified the cairo-features.h file in 
the Visual Studio page of the cairographics.org site to avoid 
inconsistent linkage DLL warnings and errors due to calling convention.
I had to add two files that are in the GNU C Library, getopt.c and 
getopt.h to get the same functionality on Win32. I renamed them 
getopt-Win32.* to make it clear they only need to be compiled on 
Win32. I'm not sure how the makefiles on Linux are generated, but 
they can (should) ignore those two files.

Best,
Antoine
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