[fuchsia] Change QEMU args to use multiboot shim.

[flowerhack]

No description provided.

[flowerhack]

So I've formatted these files as you suggested in the other PR, but I'm still getting a presubmit error, and I'm struggling to figure out what's wrong.

It seems to be complaining at the "check diff" step, but I've run generate + format locally and committed all changes, I have an empty diff locally, so I'm not sure what the issue is.

When I run "make presubmit" locally, I don't see an error at check_diff (though I do see a different error, at test_64_fork, that I don't understand either: https://gist.github.com/flowerhack/9c9622f1964ea735e826cd51f7411e58 ).

Is there something I'm missing here? If so, could a message about whatever I'm missing get included in the presubmit check? This isn't the first time I've been perplexed by check_diff's behavior.

[flowerhack]

Resolves #669

[flowerhack]

@dvyukov

[dvyukov]

When I run "make presubmit" locally, I don't see an error at check_diff (though I do see a different error, at test_64_fork, that I don't understand either:

I think it's unrelated to test_64_fork, there are error messages before that:

make[3]: powerpc64le-linux-gnu-gcc: Command not found
make[3]: aarch64-linux-gnu-gcc: Command not found

If you are running it locally, you need to do make install_prerequisites first.

[dvyukov]

Re diffs, I guess you are using go1.11? Unfortunately you need to use go1.9 or 1.10.
Go broke this with no hints of how this can be repaired :(
golang/go#25161
golang/go#26228

[flowerhack]

Closing for #684