[cairo] Note for compiling cairo with Sun Studio on Solaris

[Ginn Chen]

cairo now uses -pthread.
Sun Studio C compiler doesn't have this option, but it treats -pthread as option -p. (Prepares the object code to collect data for profiling with gprof(1). )
Then you will get an undefined symbol error ( _mcount ) at link time.

Then correct option for Sun C compiler is -mt -lpthread.

I don't know how to fix it gracefully in configure.ac.

Attached is a draft patch.
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