tidy-up: miscellaneous

- examples: sync debug output printf masks.
- INSTALL-CMAKE.md: tidy up section for some options.
- curl_sha512_256: delete comment suggesting an optimization.
- vtls/keylog: scope a variable.
- vtls/openssl: make a source code URL a permalink.
- vtls/schannel: drop redundant parentheses.
- test1119.pl: robustify `$1` -> `$s`.
- sync arg names in comments to match the code.
- tidy up and minor fixes to comments.
- fix formatting/indenting/comment/newline/include nits.
- move `UNITTEST` protos next to definitions, sync their argument names.
- make variables static.
- add parentheses to Perl `open()` calls.
- drop unnecessary double quotes in Perl.
- clang-format.

Closes #21000

src/tool_getparam.c

@@ -124,7 +124,7 @@ static const struct LongShort aliases[]= {
   {"dns-servers",                ARG_STRG, ' ', C_DNS_SERVERS},
   {"doh-cert-status",            ARG_BOOL|ARG_TLS, ' ', C_DOH_CERT_STATUS},
   {"doh-insecure",               ARG_BOOL|ARG_TLS, ' ', C_DOH_INSECURE},
-  {"doh-url"        ,            ARG_STRG, ' ', C_DOH_URL},
+  {"doh-url",                    ARG_STRG, ' ', C_DOH_URL},
   {"dump-ca-embed",              ARG_NONE|ARG_TLS, ' ', C_DUMP_CA_EMBED},
   {"dump-header",                ARG_FILE, 'D', C_DUMP_HEADER},
   {"ech",                        ARG_STRG|ARG_TLS, ' ', C_ECH},
@@ -246,7 +246,8 @@ static const struct LongShort aliases[]= {
   {"proxy-ca-native",            ARG_BOOL|ARG_TLS, ' ', C_PROXY_CA_NATIVE},
   {"proxy-cacert",               ARG_FILE|ARG_TLS, ' ', C_PROXY_CACERT},
   {"proxy-capath",               ARG_FILE|ARG_TLS, ' ', C_PROXY_CAPATH},
-  {"proxy-cert",                ARG_FILE|ARG_TLS|ARG_CLEAR, ' ', C_PROXY_CERT},
+  {"proxy-cert",                 ARG_FILE|ARG_TLS|ARG_CLEAR, ' ',
+   C_PROXY_CERT},
   {"proxy-cert-type",            ARG_STRG|ARG_TLS, ' ', C_PROXY_CERT_TYPE},
   {"proxy-ciphers",              ARG_STRG|ARG_TLS, ' ', C_PROXY_CIPHERS},
   {"proxy-crlfile",              ARG_FILE|ARG_TLS, ' ', C_PROXY_CRLFILE},