tidy-up: miscellaneous

- apply more clang-format.
- lib/version: use `CURL_ARRAYSIZE()`.
- INSTALL-CMAKE.md: sync-up an option description with others.
- examples: delete unused main args.
- examples/ftpgetinfo: document `_CRT_SECURE_NO_WARNINGS` symbol.
- delete remaining stray duplicate lines.
- acinclude.m4: drop an unnecessary x-hack.
- vtls/mbedtls: join a URL split into two lines.
- src/tool_cb_see: add parentheses around macro expressions.
- src/tool_operate: move literals to the right side of comparisons.
- libtests: sync up fopen/fstat error messages between tests.
- curl_setup.h: replace `if ! defined __LP64` with `ifndef __LP64`.
  I assume it makes no difference on Tandem systems, as the latter form
  is already used in `include/curl/system.h`.

Closes #20018

scripts/managen

@@ -1127,7 +1127,7 @@ HEAD
                 $bitmask .= ' | ';
             }
         }
-        $bitmask =~ s/(?=.{76}).{1,76}\|/$&\n  /g;
+        $bitmask =~ s/(?=.{76}).{1,76}\|/$&\n   /g;
         my $arg = $arglong{$long};
         if($arg) {
             $opt .= " $arg";
@@ -1135,7 +1135,7 @@ HEAD
         my $desc = $helplong{$f};
         $desc =~ s/\"/\\\"/g; # escape double quotes
 
-        my $line = sprintf "  {\"%s\",\n   \"%s\",\n  %s},\n", $opt, $desc, $bitmask;
+        my $line = sprintf "  { \"%s\",\n    \"%s\",\n   %s },\n", $opt, $desc, $bitmask;
 
         if(length($opt) > 78) {
             print STDERR "WARN: the --$long name is too long\n";