curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

curl: --test-duphandle in debug builds runs "duphandled"

Using this option (only available in debug builds) makes curl always
call curl_easy_duphandle() on the handle before using it.

To help us catch curl_easy_duphandle() mistakes better.

Add a CI job using this.

Bonus: the previous runtests option -e is now also supported as
--test-event

Closes #15504

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test{440,441,493,977}: add "HTTP proxy" keywords

... so the tests can be automatically skipped when
using an external proxy like Privoxy.

Closes #8959

tests: make three tests pass until 2037

after 2038 something in test1915 fails on 32-bit OSes

Closes #7512

c-hyper: abort CONNECT response reading early on non 2xx responses

Fixes test 493

Closes #7209

test 493: require https in curl to run

Closes #6927

hsts: enable by default

No longer considered experimental.

Closes #6700

tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

tests: fixup several tests

missing CRs and modified %hostip

lib556/test556: use a real HTTP version to make test reuse more convenient

make sure the weekday in Date headers

tests: fixup several tests

missing CRs and modified %hostip

lib556/test556: use a real HTTP version to make test reuse more convenient

make sure the weekday in Date headers matches the date

test61: replace stray "^M" (5e 4d) at the end of a cookie with a '^M' (0d)

Gets the test working with external proxies like Privoxy again.

Closes #6463

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test493: verify --hsts upgrade and that %{url_effective} reflects that

Closes #6175