constify arguments of copy_file() and copydir()

When Who What
2023-01-18 00:18:52 Nathan Bossart (bossartn) Closed in commitfest 2023-03 with status: Committed
2023-01-18 00:18:51 Nathan Bossart (bossartn) Changed committer to michael-kun
2023-01-15 16:12:25 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2023-01-15 16:12:25 Nathan Bossart (bossartn) Changed targetversion to 16
2023-01-15 16:12:13 Nathan Bossart (bossartn) Attached mail thread 20230114231126.GA2580330@nathanxps13
2023-01-15 16:12:13 Nathan Bossart (bossartn) Created patch record