std.Target: Remove minix OS tag.

It has not seen development in 6 years. RIP.

* https://github.com/Stichting-MINIX-Research-Foundation/minix/commits/master
* https://groups.google.com/g/minix3/c/nUG1NwxXXkg
e211dce6fcAlex Rønne Petersen committed on 8/12/2024, 6:59:49 AMparent4d4a023
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