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If you want to dig through history, FreshBSD may be of use: https://v4.freshbsd.org/project/openbsd/src?q=clang

Side-note: In the changed file, the first line is “$OpenBSD: bsd.own.mk,v 1.186 2017/07/26 19:44:42 robert Exp $”. Does anyone know if this line is updated by CVS or some other tool?

That's a CVS keyword, it's updated when the file is checked out or after it's committed. 1.186 is the most recent version of that file.

Awesome, thanks a bunch!