unit1660: fix unreachable code warning in no-SSL builds

Or no-HTTP, no-HSTS builds, also MSH3 builds.

CMake, VS2022, Debug, x64, no SSL, Static, Build-only:
```
C:\projects\

unit1660: fix unreachable code warning in no-SSL builds

Or no-HTTP, no-HSTS builds, also MSH3 builds.

CMake, VS2022, Debug, x64, no SSL, Static, Build-only:
```
C:\projects\curl\tests\unit\unit1660.c(46,1): error C2220: the following warning is treated as an error
C:\projects\curl\tests\unit\unit1660.c(46,1): warning C4702: unreachable code
```
Ref: https://ci.appveyor.com/project/curlorg/curl/builds/50531210/job/cjewvo9agavthr3o#L216

Required-by: #14922
Cherry-picked from #14772
Closes #14971

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llist: remove direct struct accesses, use only functions

- Turned them all into functions to also do asserts etc.

- The llist related structs got all their fields renamed in order t

llist: remove direct struct accesses, use only functions

- Turned them all into functions to also do asserts etc.

- The llist related structs got all their fields renamed in order to make
sure no existing code remains using direct access.

- Each list node struct now points back to the list it "lives in", so
Curl_node_remove() no longer needs the list pointer.

- Rename the node struct and some of the access functions.

- Added lots of ASSERTs to verify API being used correctly

- Fix some cases of API misuse

Add docs/LLIST.md documenting the internal linked list API.

Closes #14485

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tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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unit tests: use the unit test infrastructure better

Allow UNITTEST_STOP to return the error code, use the fail & abort
macros to indicate test failure and return success instead of fail

unit tests: use the unit test infrastructure better

Allow UNITTEST_STOP to return the error code, use the fail & abort
macros to indicate test failure and return success instead of fail if
the unit test can't test anything because of missing features at
compile-time. A couple of tests could never fail because they were
overriding the failure return code.

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tests: fix unit tests to run with a dynamic log directory

Ref: #10818

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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tests: several enumerated type cleanups

To please icc

Closes #9179

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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hsts: enable by default

No longer considered experimental.

Closes #6700

copyright: fix missing year (range) updates

lib/unit tests: add missing curl_global_cleanup() calls

infof/failf calls: fix format specifiers

Update a few format specifiers to match what is being printed.

Closes #6241

curl.se: new home

Closes #6172

hsts: add read/write callbacks

- read/write callback options
- man pages for the 4 new setopts
- test 1915 verifies the callbacks

Closes #5896

hsts: add support for Strict-Transport-Security

- enable in the build (configure)
- header parsing
- host name lookup
- unit tests for the above
- CI build
- CURL_VERSION

hsts: add support for Strict-Transport-Security

- enable in the build (configure)
- header parsing
- host name lookup
- unit tests for the above
- CI build
- CURL_VERSION_HSTS bit
- curl_version_info support
- curl -V output
- curl-config --features
- CURLOPT_HSTS_CTRL
- man page for CURLOPT_HSTS_CTRL
- curl --hsts (sets CURLOPT_HSTS_CTRL and works with --libcurl)
- man page for --hsts
- save cache to disk
- load cache from disk
- CURLOPT_HSTS
- man page for CURLOPT_HSTS
- added docs/HSTS.md
- fixed --version docs
- adjusted curl_easy_duphandle

Closes #5896

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