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

lib/ftplistparser.c

@@ -325,8 +325,7 @@ static CURLcode ftp_pl_insert_finfo(struct Curl_easy *data,
 
   /* filter pattern-corresponding filenames */
   Curl_set_in_callback(data, TRUE);
-  if(compare(data->set.fnmatch_data, wc->pattern,
-             finfo->filename) == 0) {
+  if(compare(data->set.fnmatch_data, wc->pattern, finfo->filename) == 0) {
     /* discard symlink which is containing multiple " -> " */
     if((finfo->filetype == CURLFILETYPE_SYMLINK) && finfo->strings.target &&
        (strstr(finfo->strings.target, " -> "))) {