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/cookie.c

@@ -423,18 +423,17 @@ static CURLcode storecookie(struct Cookie *co, struct Curl_str *cp,
 
 /* this function return errors on OOM etc, not on plain cookie format
    problems */
-static CURLcode
-parse_cookie_header(struct Curl_easy *data,
-                    struct Cookie *co,
-                    struct CookieInfo *ci,
-                    bool *okay, /* if the cookie was fine */
-                    const char *ptr,
-                    const char *domain, /* default domain */
-                    const char *path,   /* full path used when this cookie is
-                                           set, used to get default path for
-                                           the cookie unless set */
-                    bool secure)  /* TRUE if connection is over secure
-                                     origin */
+static CURLcode parse_cookie_header(
+  struct Curl_easy *data,
+  struct Cookie *co,
+  struct CookieInfo *ci,
+  bool *okay,         /* if the cookie was fine */
+  const char *ptr,
+  const char *domain, /* default domain */
+  const char *path,   /* full path used when this cookie is
+                         set, used to get default path for
+                         the cookie unless set */
+  bool secure)        /* TRUE if connection is over secure origin */
 {
   /* This line was read off an HTTP-header */
   time_t now = 0;
@@ -930,17 +929,16 @@ static bool replace_existing(struct Curl_easy *data,
  * IPv6 address.
  *
  */
-CURLcode
-Curl_cookie_add(struct Curl_easy *data,
-                struct CookieInfo *ci,
-                bool httpheader, /* TRUE if HTTP header-style line */
-                bool noexpire, /* if TRUE, skip remove_expired() */
-                const char *lineptr,   /* first character of the line */
-                const char *domain, /* default domain */
-                const char *path,   /* full path used when this cookie is set,
-                                       used to get default path for the cookie
-                                       unless set */
-                bool secure)  /* TRUE if connection is over secure origin */
+CURLcode Curl_cookie_add(
+  struct Curl_easy *data,
+  struct CookieInfo *ci,
+  bool httpheader,     /* TRUE if HTTP header-style line */
+  bool noexpire,       /* if TRUE, skip remove_expired() */
+  const char *lineptr, /* first character of the line */
+  const char *domain,  /* default domain */
+  const char *path,    /* full path used when this cookie is set, used
+                          to get default path for the cookie unless set */
+  bool secure)         /* TRUE if connection is over secure origin */
 {
   struct Cookie comem;
   struct Cookie *co;