arx 0.2.1 (new formula)
arx 0.2.1 (new formula)

The arx tool captures the parameters of an execution and encodes them as
an executable, making for easy, consistent transfer and repetition of a
particular run.

Fix audit issues

- Don't use formula name in description
- Use system correctly in install and test

Improve test based on feedback from DomT4

- Pathname#write instead of File#write
- shell_output instead of backticks
- assert_match on output from test script

Improve test based on feedback from bfontaine

- Use #{bin}/arx instead of arx
- Drop parenthesis for chmod

Improve install based on feedback from DomT4

Find platform tag in the same way as the Makefile does.

Closes #45802.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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