ref: 87f457bc54dc3686f61b02d9d12c2576caf09a13
parent: d9e95d51727004924d5c5cd495a53fd286543377
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Sat Dec 16 19:04:23 EST 2023
remove the need for preprocessor; move platform-specific stuff into designated plan9/ and unix/