tools: don’t emit illegal utf-8 from icutrim/iculslocs

- argv[0] was being emitted into a utf-8 stream, but argv[0] may
not be legal utf-8
- fix by not emitting argv[0] (was only for a source comment)
- partially resolves https://github.com/nodejs/node/issues/17077

PR-URL: https://github.com/nodejs/node/pull/19756
Fixes: https://github.com/nodejs/node/issues/17077


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Nikolai Vavilov <vvnicholas@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>