tidy-up: mostly whitespace nits

- delete completed TODO from `./CMakeLists.txt`.
- convert a C++ comment to C89 in `./CMake/CurlTests.c`.
- delete duplicate EOLs from EOF.
- add

tidy-up: mostly whitespace nits

- delete completed TODO from `./CMakeLists.txt`.
- convert a C++ comment to C89 in `./CMake/CurlTests.c`.
- delete duplicate EOLs from EOF.
- add missing EOL at EOF.
- delete whitespace at EOL (except from expected test results).
- convert tabs to spaces.
- convert CRLF EOLs to LF in GHA yaml.
- text casing fixes in `./CMakeLists.txt`.
- fix a codespell typo in `packages/OS400/initscript.sh`.

Closes #11772

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bug_report: require reporters to specify curl and os versions

- Change curl version and os sections from single-line input to
multi-line textarea.

- Require curl version and o

bug_report: require reporters to specify curl and os versions

- Change curl version and os sections from single-line input to
multi-line textarea.

- Require curl version and os sections to be filled out before report
can be submitted.

Closes https://github.com/curl/curl/pull/11636

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bug_report: use issue forms instead of markdown template

Issue forms allow you to define web-like input forms using YAML
syntax. It allows you to guide the reporter to get the required

bug_report: use issue forms instead of markdown template

Issue forms allow you to define web-like input forms using YAML
syntax. It allows you to guide the reporter to get the required
information.

Signed-off-by: Jan Macku <jamacku@redhat.com>
Closes #11474

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