.machine for Darwin, new cctools required

[Kelley Cook]

--- Stan Shebs <shebs@apple.com> wrote:

> Yes, thanks! The error could be made a little more helpful by adding
> ", such as cctools-528 or later" (so phrased in case the already
> submitted Mach-O support for gas goes in, and resulting in a chance
> that a non-cctools assembler might be installed).

The patch was checked in last night; feel free to modify the wording as
you see fit.

KC