The DCL code had a typo in one of the commands which would make the
OpenSSL discovery on VAX fail. The correct syntax is F$ENVIRONMENT.

Closes #3407
Reviewed-by: Viktor Szakats <commit@vszakats.net>

Commit 709cf76f6bb7dbac deprecated USE_SSLEAY, as curl since long isn't
compatible with the SSLeay library. This removes the few leftovers that
were omitted in the less frequently used platform targets.

Closes #3270
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

Commit efc696a2e09225bfeab4 renamed persistant.c to persistent.c to
fix the typo in the name, but missed to update the OpenVMS package
files which still looked for the old name.

Closes #3217
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Reviewed-by: Viktor Szakats <commit@vszakats.net>

As has been outlined in the DEPRECATE.md document, the axTLS code has
been disabled for 6 months and is hereby removed.

Use a better supported TLS library!

Assisted-by: Daniel Gustafsson
Closes #3194

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
  in manual examples

Closes https://github.com/curl/curl/pull/3037

Closes https://github.com/curl/curl/pull/3031

Detected using the `codespell` tool (version 1.13.0).

Also secure and fix an URL.

Detected using the `codespell` tool.

Also contains one URL protocol upgrade.

Closes https://github.com/curl/curl/pull/2334

Closes #1741