GHA: tidy up parallel options, improve performance for some jobs

- replace `--parallel <n>` and `-j<n>` for individual commands with
  `MAKEFLAGS`, for jobs not yet doing it.
  This enables parallel builds in distcheck / maketgz-and-verify-in-tree,
  where `-j` option was missing.
- add `--parallel` for iOS Xcode job for improved performance.
- drop redundant `-j5` for Android jobs.
- drop stray `cmake --config` options from single-target jobs (cygwin,
  msys/mingw, dl-mingw, non-native). Drop redundant
  `CMAKE_RUNTIME_OUTPUT_DIRECTORY_*` settings too.
- GHA/windows: add timeout for package install steps where missing.
- GHA/non-native: specify target type explicitly for iOS cmake jobs.
  Xcode default was already Debug, single-target default was generic,
  now it's Release, with unity batch to keep it fast.

`MAKEFLAGS` is necessary for autotools jobs and CMake jobs using
the default (GNU Make) generator. It's ignored by Ninja and other tools.
`cmake --parallel` is still necessary for jobs with Visual Studio or
Xcode generators. Parallelism is 5 for GHA Linux and Windows runners,
4 for macOS, 3 for VMs, 2 for AppVeyor.

Closes #16502
4 files changed
tree: 81d790a4984a01b18d2c905e50e14550b7148402
  1. .circleci/
  2. .github/
  3. CMake/
  4. docs/
  5. include/
  6. lib/
  7. LICENSES/
  8. m4/
  9. packages/
  10. plan9/
  11. projects/
  12. scripts/
  13. src/
  14. tests/
  15. winbuild/
  16. .dir-locals.el
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .mailmap
  21. acinclude.m4
  22. appveyor.sh
  23. appveyor.yml
  24. buildconf
  25. CHANGES.md
  26. CMakeLists.txt
  27. configure.ac
  28. COPYING
  29. curl-config.in
  30. Dockerfile
  31. GIT-INFO.md
  32. libcurl.pc.in
  33. Makefile.am
  34. README
  35. README.md
  36. RELEASE-NOTES
  37. renovate.json
  38. REUSE.toml
  39. SECURITY.md
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