Plain and simple, you can't. Plugins are meant to function with Windows UTAU, they're EXEs.
If you want to, you could try using wine or something, but it's a very finicky process. Plugins aren't entirely necessary, but it's resamplers that are more significant. Unfortunately the wine-workaround doesn't seem to work the resamplers for me, so I'm stuck rendering through UTAU-Synth's default engine (Or transferring my files to a different computer for rendering)