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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tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly w

tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly why a test has failed.

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tests: update cookie expiry dates to far in the future

This allows testing Y2038 with system time set to after that, so that
actual Y2038 issues can be exposed, and not masked by expiry

tests: update cookie expiry dates to far in the future

This allows testing Y2038 with system time set to after that, so that
actual Y2038 issues can be exposed, and not masked by expiry errors.

Fixes #11576
Closes #11610

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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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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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cleanup: constify unmodified static structs

Constify a number of static structs that are never modified. Make them
const to show this.

Closes #7759

hsts: CURLSTS_FAIL from hsts read callback should fail transfer

... and have CURLE_ABORTED_BY_CALLBACK returned.

Extended test 1915 to verify.

Reported-by: Jonathan Cardoso

hsts: CURLSTS_FAIL from hsts read callback should fail transfer

... and have CURLE_ABORTED_BY_CALLBACK returned.

Extended test 1915 to verify.

Reported-by: Jonathan Cardoso
Fixes #7726
Closes #7729

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hsts: handle unlimited expiry

When setting a blank expire string, meaning unlimited, curl would pass
TIME_T_MAX to getime_r() when creating the output, while on 64 bit
systems such a

hsts: handle unlimited expiry

When setting a blank expire string, meaning unlimited, curl would pass
TIME_T_MAX to getime_r() when creating the output, while on 64 bit
systems such a large value cannot be convetered to a tm struct making
curl to exit the loop with an error instead. It can't be converted
because the year it would represent doesn't fit in the 'int tm_year'
field!

Starting now, unlimited expiry is instead handled differently by using a
human readable expiry date spelled out as "unlimited" instead of trying
to use a distant actual date.

Test 1660 and 1915 have been updated to help verify this change.

Reported-by: Jonathan Cardoso
Fixes #7720
Closes #7721

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misc: update incorrect copyright year ranges

Closes #7577

tests: make three tests pass until 2037

after 2038 something in test1915 fails on 32-bit OSes

Closes #7512

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