[CPP PATCH] Fix warning & other cleanups.

[Nathan Sidwell]

I noticed I'd inadvertently allowed a trailing comma to creep in, 
leading to annoying warnings.  I'd also missed a few uses of the 
cpp_macro_p function and friends.  Plus Bernhard had suggested there's a 
name for 255 when it's encoding unsigned char range.

Fixed thusly.

nathan
-- 
Nathan Sidwell
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