build: tidy up and improve versioned-symbols options

- autotools: add support for custom prefix.
Usage: `--enable-versioned-symbols=MYPREFIX_`
Catching up with cmake.

-

build: tidy up and improve versioned-symbols options

- autotools: add support for custom prefix.
Usage: `--enable-versioned-symbols=MYPREFIX_`
Catching up with cmake.

- add default versioned prefix for Rustls builds.

- delete `HIDDEN` entry from version script `lib/libcurl.vers.in`.
It referred to symbol names that never existed in libcurl.

- cmake: use `lib/libcurl.vers.in` as a template instead of generating
it from scratch. Adapt `./configure` accordingly, and add comments
to keep hard-wired soname in sync with `lib/Makefile.soname`.

- autotools: delete Schannel and Secure Transport version prefixes.
Windows and macOS don't support the versioned symbols option.

Follow-up to 7b1444979094a365c82c665cce0e2ebc6b69467b #14378
Closes #14818

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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cmake: set the soname on the shared library

Set SONAME and VERSION for platforms we think this works on. Remove
issue from KNOWN_BUGS.

Assisted-by: Jakub Zakrzewski

Clo

cmake: set the soname on the shared library

Set SONAME and VERSION for platforms we think this works on. Remove
issue from KNOWN_BUGS.

Assisted-by: Jakub Zakrzewski

Closes #10023

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