```
Use of uninitialized value $errors in exit at .github/scripts/badwords.pl line 87.
Use of uninitialized value $o in concatenation (.) or string at ../.github/scripts/randcurl.pl line 99.
```
Follow-up to 2ec54556d4#17877
Cherry-picked from #18042Closes#18047
- add 'use warnings' and 'use strict' where missing from Perl scripts.
- fix 'Use of uninitialized value'.
- fix missing declarations.
- test1140.pl: fix 'Possible precedence issue with control flow operator'.
- fix other misc issues.
Most actual errors found during this PR were fixed and merged via
separate PRs.
Likely there are remaining warnings not found and fixed in this PR.
Closes#17877
This means words, phrases or things we have decided not to use - words that
are spelled right according to the dictionary but we want to avoid. In the
name of consistency and better documentation.
Closes#12764