[PATCH]: Add support for MacOSX 64bits target

[Nick Clifton]

Hi Tristan,

> Do you mean building on gnu/linux with --enable-targets=i386-mac-darwin ?
> (As this patch only modifies mach-o.[ch] files, it is useless to build 
> only for the gnu/linux target).

No I meant building a native toolchain on gnu/linux.  I know that this 
is effectively "useless" for testing this patch, but I believe in 
paranoia - just because the patch cannot affect other toolchains that 
does not mean that they should not be tested.  I expect the testing to 
be a no-op, but it is a good habit to have.  One day it will catch a 
real bug...

Cheers
   Nick