[ABI] Compile fix and debug_link flag

[Bryce McKinlay]

I had to make a few changes to natClass.cc so it would compile on my FC1 
system. I also renamed the "foobar" flag to "debug_link" for printing 
out debug information. Hopefully we can extend this more in the future - 
it would be nice to have some command line debugging options to print 
out class metadata and linking tables.

Checking this in to the abi branch.

Bryce

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