[util] Add cairo-trace.

This tool can be used to trace all the cairo function calls made by an
applications.  This is useful for either extracting a test case triggering
a bug from an application, or simply to get a general idea of how an
application is using cairo.

After make install, cairo-trace program arguments, will print out all the
cairo calls to the terminal and also capture theme in ./program.$pid.trace

The format of the output is CairoScript, watch this space for more
cairo-script tools!

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