tidy-up: spelling

C89, Schannel, Secure Transport, contractions.

Cherry-picked from #14692
Closes #14996

tidy-up: spelling quiche and Rustls

Closes #14605

curl_sha512_256: fix symbol collisions with nettle library

`SHA512_256_BLOCK_SIZE`, `SHA512_256_DIGEST_SIZE` macros were both
defined within curl and also in the nettle library required

curl_sha512_256: fix symbol collisions with nettle library

`SHA512_256_BLOCK_SIZE`, `SHA512_256_DIGEST_SIZE` macros were both
defined within curl and also in the nettle library required by GnuTLS.

Fix it by namespacing the curl macros.

Cherry-picked from #14495
Closes #14514

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code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname

code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname
- file name => filename
- user name = username
- man page => manpage
- run-time => runtime
- set-up => setup
- back-end => backend
- a HTTP => an HTTP
- Two spaces after a period => one space after period

Closes #14073

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cmake: fix building in unity mode

- Fix sha256 and sha512 duplicate macro names (eg function-like macro Ch
is now Sha256_Ch and Sha512_Ch).

- Avoid defining short defines like

cmake: fix building in unity mode

- Fix sha256 and sha512 duplicate macro names (eg function-like macro Ch
is now Sha256_Ch and Sha512_Ch).

- Avoid defining short defines like R, S. (eg S is now Sha256_S).

Closes https://github.com/curl/curl/pull/13751

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curl_setup.h: detect 'inline' support

Closes #13355

curl_sha512_256: do not use workaround for NetBSD when not needed

Assisted-by: riastradh on github
Assisted-by: Michael Kaufmann
Closes #13225

curl_sha512_255: fix detection of OpenSSL 1.1.1 or later

Use the same OPENSSL_VERSION_NUMBER comparison as in lib/vtls/openssl.c.

Closes #13208

curl_sha512_256: work around a NetBSD bug

Based on Michael Kaufmann analysis and suggestion

Closes #13133

sha512_256: add support for GnuTLS and OpenSSL

This is a follow-up for PR #12897.

Add support for SHA-512/256 digest calculation by TLS backends.
Currently only OpenSSL and GnuT

sha512_256: add support for GnuTLS and OpenSSL

This is a follow-up for PR #12897.

Add support for SHA-512/256 digest calculation by TLS backends.
Currently only OpenSSL and GnuTLS (actually, nettle) support
SHA-512/256.

Closes #13070

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sha512_256: remove the cast macro, minor language/format edits

Follow-up to cbe41d151d6a100c

Closes #12966

SHA-512/256: implement hash algorithm

Closes #12897