CI: disable dependency tracking in most autotools builds

For better build performance. Dependency tracking causes a build
overhead while compiling to help a subsequent build, but in CI t

CI: disable dependency tracking in most autotools builds

For better build performance. Dependency tracking causes a build
overhead while compiling to help a subsequent build, but in CI there is
never one and the extra work is discarded.

Closes #13794

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GHA: bump actions/checkout from 4.1.4 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.4 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/re

GHA: bump actions/checkout from 4.1.4 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.4 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/0ad4b8fadaa221de15dcec353f45205ec38ea70b...a5ac7e51b41094c92402da3b24376905380afc29)

---
updated-dependencies:
- dependency-name: actions/checkout
dependency-type: direct:production
update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #13720

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GHA: pin dependencies

Closes #13628

ci: remove microsoft-prod.list

This is added by default, and it is often broken, but we don't need
anything from it.

Closes #13473

appveyor: replace PowerShell with bash + parallel autotools

PowerShell works (after a steep development curve), but one property of
it stuck and kept causing unresolvable usability issue

appveyor: replace PowerShell with bash + parallel autotools

PowerShell works (after a steep development curve), but one property of
it stuck and kept causing unresolvable usability issues: With
`$ErrorActionPreference=Stop`, it does abort on failures, but shows only
the first line of the error message. In `Continue` mode, it shows the
full error message, but doesn't stop on all errors. Another issue is
PowerShell considering any stderr output as if the command failed (this
has been improved in 7.2 (2021-Nov), but fixed versions aren't running
in CI and will not be for a long time in all test images.)

Thus, we're going with bash.

Also:
- use `-j2` with autotools tests, making them finish 5-15 minutes per
job faster.
- omit `POSIX_PATH_PREFIX`.
- use `WINDIR`.
- prefer forward slashes.

Follow-up to: 75078a415d9c769419aed4153d3d525a8eba95af #11999
Ref: #12444

Fixes #12560
Closes #12572

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tidy-up: fix yamllint whitespace issues

Closes #12466

gha: bump actions to latest versions

- actions@checkout@v4 (from v3 and v2)

- fsfe/reuse-action@v2 (from v1)

Closes #12000

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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