pytest: improvements

- set CURL_CI for pytest runs in CI environments
- exclude timing sensitive tests from CI runs
- for failed results, list only the log and stat of
the fail

pytest: improvements

- set CURL_CI for pytest runs in CI environments
- exclude timing sensitive tests from CI runs
- for failed results, list only the log and stat of
the failed transfer

- fix type in http.c comment

Closes #11812

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CI: move on to ngtcp2 v0.19.1

Closes #11809

CI: run Circle macOS builds on x86 for now

The ARM machines aren't ready for us and requesting them now causes
warnings e-mails to be sent to some PR pushers.

Ref: #11771

http3: adjust cast for ngtcp2 v0.19.0

ngtcp2 v0.19.0 made size of `ecn` member of `ngtcp2_pkt_info`
an `uint8_t` (was: `uint32_t`). Adjust our local cast accordingly.

Fixes:

http3: adjust cast for ngtcp2 v0.19.0

ngtcp2 v0.19.0 made size of `ecn` member of `ngtcp2_pkt_info`
an `uint8_t` (was: `uint32_t`). Adjust our local cast accordingly.

Fixes:
```
./curl/lib/vquic/curl_ngtcp2.c:1912:12: warning: implicit conversion loses integer precision: 'uint32_t' (aka 'unsigned int') to 'uint8_t' (aka 'unsigned char') [-Wimplicit-int-conversion]
pi.ecn = (uint32_t)ecn;
~ ^~~~~~~~~~~~~
```

Also bump ngtcp2, nghttp3 and nghttp2 to their latest versions in our
docs and CI.

Ref: https://github.com/ngtcp2/ngtcp2/commit/80447281bbc94af53f8aa7a4cfc19175782894a3
Ref: https://github.com/ngtcp2/ngtcp2/pull/877
Closes #11798

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http: fix sending of large requests

- refs #11342 where errors with git https interactions
were observed
- problem was caused by 1st sends of size larger than 64KB
which resu

http: fix sending of large requests

- refs #11342 where errors with git https interactions
were observed
- problem was caused by 1st sends of size larger than 64KB
which resulted in later retries of 64KB only
- limit sending of 1st block to 64KB
- adjust h2/h3 filters to cope with parsing the HTTP/1.1
formatted request in chunks

- introducing Curl_nwrite() as companion to Curl_write()
for the many cases where the sockindex is already known

Fixes #11342 (again)
Closes #11803

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pytest: fix check for slow_network skips to only apply when intended

Closes #11801

curl_url_get/set.3: add missing semicolon in SYNOPSIS

CURLOPT_URL.3: explain curl_url_set() uses the same parser

CURLOPT_URL.3: add two URL API calls in the see-also section

CI: add a 32-bit i686 Linux build

This is done by cross-compiling under regular x86_64 Linux. Since the
kernel offers backwards compatibility, the binaries can be tested as
normal.

CI: add a 32-bit i686 Linux build

This is done by cross-compiling under regular x86_64 Linux. Since the
kernel offers backwards compatibility, the binaries can be tested as
normal.

Closes #11799

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tests: fix a type warning on 32-bit x86

tests: delete stray `.orig` file

Follow-up to 331b89a319d0067fa1e6441719307cfef9c7960f
Closes #11797

RELEASE-NOTES: synced

lib: silence compiler warning in inet_ntop6

```
./curl/lib/inet_ntop.c:121:21: warning: possible misuse of comma operator here [-Wcomma]
cur.base = i, cur.len = 1;

lib: silence compiler warning in inet_ntop6

```
./curl/lib/inet_ntop.c:121:21: warning: possible misuse of comma operator here [-Wcomma]
cur.base = i, cur.len = 1;
^
./curl/lib/inet_ntop.c:121:9: note: cast expression to void to silence warning
cur.base = i, cur.len = 1;
^~~~~~~~~~~~
(void)( )
```

Closes #11790

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transfer: also stop the sending on closed connection

Previously this cleared the receiving bit only but in some cases it is
also still sending (like a request-body) when disconnected and

transfer: also stop the sending on closed connection

Previously this cleared the receiving bit only but in some cases it is
also still sending (like a request-body) when disconnected and neither
direction can continue then.

Fixes #11769
Reported-by: Oleg Jukovec
Closes #11795

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docs: change `sub-domain` to `subdomain`

https://en.wikipedia.org/wiki/Subdomain

Closes #11793

multi: more efficient pollfd count for poll

- do not use separate pollfds for sockets that have POLLIN+POLLOUT

Closes #11792

http2: polish things around POST

- added test cases for various code paths
- fixed handling of blocked write when stream had
been closed inbetween attempts
- re-enabled DEBUGAS

http2: polish things around POST

- added test cases for various code paths
- fixed handling of blocked write when stream had
been closed inbetween attempts
- re-enabled DEBUGASSERT on send with smaller data size

- in debug builds, environment variables can be set to simulate a slow
network when sending data. cf-socket.c and vquic.c support
* CURL_DBG_SOCK_WBLOCK: percentage of send() calls that should be
answered with a EAGAIN. TCP/UNIX sockets.
This is chosen randomly.
* CURL_DBG_SOCK_WPARTIAL: percentage of data that shall be written
to the network. TCP/UNIX sockets.
Example: 80 means a send with 1000 bytes would only send 800
This is applied to every send.
* CURL_DBG_QUIC_WBLOCK: percentage of send() calls that should be
answered with EAGAIN. QUIC only.
This is chosen randomly.

Closes #11756

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docs: add curl_global_trace to some SEE ALSO sections

Closes #11791

os400: fix checksrc nits

Closes #11789

hyper: remove `hyptransfer->endtask`

`Curl_hyper_stream` needs to distinguish between two kinds of
`HYPER_TASK_EMPTY` tasks: (a) the `foreach` tasks it creates itself, and
(b) backgr

hyper: remove `hyptransfer->endtask`

`Curl_hyper_stream` needs to distinguish between two kinds of
`HYPER_TASK_EMPTY` tasks: (a) the `foreach` tasks it creates itself, and
(b) background tasks that hyper produces. It does this by recording the
address of any `foreach` task in `hyptransfer->endtask` before pushing
it into the executor, and then comparing that against the address of
tasks later polled out of the executor.

This works right now, but there is no guarantee from hyper that the
addresses are stable. `hyper_executor_push` says "The executor takes
ownership of the task, which should not be accessed again unless
returned back to the user with `hyper_executor_poll`". That wording is a
bit ambiguous but with my Rust programmer's hat on I read it as meaning
the task returned with `hyper_executor_poll` may be conceptually the
same as a task that was pushed, but that there are no other guarantees
and comparing addresses is a bad idea.

This commit instead uses `hyper_task_set_userdata` to mark the `foreach`
task with a `USERDATA_RESP_BODY` value which can then be checked for,
removing the need for `hyptransfer->endtask`. This makes the code look
more like that hyper C API examples, which use userdata for every task
and never look at task addresses.

Closes #11779

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ws: fix spelling mistakes in examples and tests

Closes #11784

tool_filetime: make -z work with file dates before 1970

Fixes #11785
Reported-by: Harry Sintonen
Closes #11786

build: fix portability of mancheck and checksrc targets

At least FreeBSD preserves cwd across makefile lines, so rules
consisting of more than one "cd X; do_something" must be explicitly

build: fix portability of mancheck and checksrc targets

At least FreeBSD preserves cwd across makefile lines, so rules
consisting of more than one "cd X; do_something" must be explicitly run
in a subshell to avoid this. This problem caused the Cirrus FreeBSD
build to fail when parallel make jobs were enabled.

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CI: adjust labeler match patterns for new & obsolete files