Takayuki Matsuoka e592478eea add: cli: --ignore-missing ...

- Add `--ignore-missing` option for `xxhsum`.
- Add test script `tests/cli-ignore-missing.sh` and related `Makefile` entries.
  - Note that we still don't have CLI test entry in our CI.

`xxhsum` returns failure exit code when

- `--ignore-missing` is presented.
- Checksum file is specified.
- But `XSUM_checkFile()` doesn't read actual file (may) due to `--ignore-missing`

If so, `xxhsum` reports `no file was verified` with failure exit code.

<details><summary>`--ignore-missing` related code in `digest.c`</summary>
- 2f1cffe07a/src/digest.c (L190-L191)
- 2f1cffe07a/src/digest.c (L362)
- 2f1cffe07a/src/digest.c (L380)
- 2f1cffe07a/src/digest.c (L506)
- 2f1cffe07a/src/digest.c (L978-L982)
- 2f1cffe07a/src/digest.c (L1236-L1240)
- 2f1cffe07a/src/digest.c (L1325-L1328)
- 2f1cffe07a/src/digest.c (L1429-L1431)
- 2f1cffe07a/src/digest.c (L1558-L1564)
</details>

2023-07-10 17:43:40 +09:00

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