[RFA] Darwin/x86 port (v4 - part 0/4)

[Stan Shebs]

Tristan Gingold wrote:
> + @item set debug inferior @var{num}
We're changing this from "inferior" to "darwin", right?
> + When set to a non zero value, enables debugging messages specific to 
> mach-o
> + object file processing.  The bigger the value is the more verbose the
> + output is.
Capitalize "Mach-O" here. Also add a comment to the effect that this is 
mainly to diagnose problems internal to GDB, and should not be needed in 
normal usage.

With these changes, the bits here are OK for the trunk (and I'll be the 
first person to try them out once checked in!).

Stan