options: process project options before machine options

[bonzini]

I'm not sure if this is the right fix or too big a hammer, but let's try.

Fixes: #14608

[bonzini]

Old code indeed used the same order as after the patch. From CoreData.set_default_options:

        options: T.MutableMapping[OptionKey, T.Any] = OrderedDict()
        for k, v in default_options.items(): # process project default options
            if not subproject or k.subproject == subproject:
                options[k] = v
        options.update(env.options)          # override them with machine default and command line options
        env.options = options

[bonzini]

@jpakkane can you confirm that this wasn't intentional?