mach-o objfmt

[Henryk Richter]

Here we go with the promised update of the mach-o object format. As  
pointed out,
I changed the relocation handling for rip-relative instructions to  
allow the
intended [_foo wrt rip] notation.

So far, my own code is working fine after the slight changes in  
pointer arithmetics,
both in 32 bit and 64 bit modes.

I added some text regarding known issues and shortcomings to the top of
the objfmt file and updated the test routines.

Support for dynamic binaries and symbol-symbol wrt relocation is  
still missing.

I'd be delighted if my routines would find their way into yasm.

--Henryk

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