Since a 32-bit build of xplanet presumably wouldn't work on Mojave, which I'd like to move to, just for giggles I removed that line from the Portfile, uninstalled, and reinstalled. It successfully built a 64-bit executable, which works (at least in the trivial case of run the command with no options, which is all I tried).
Some versions back it was necessary I suppose, since it used 32-bit-only QuickTime or some such; but it's fine now. I filed #57239 for this.
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