tidy-up: miscellaneous

- vms/curlmsg_vms.h: delete unused/commented code.
- vtls/schannel_verify: sort includes.
- typecheck-gcc.h: fix indent and alignment.
- lib/config-win32.h: drop idle `#undef`.
- spacecheck: check for stray empty lines before after curly braces.
- make literals more readable: 1048576 -> 1024 * 1024
- scope variables.
- use ISO date in a comment.
- drop redundant parentheses.
- drop empty comments.
- unfold lines.
- duplicate/stray spaces in comments.
- fix indent, whitespace, minor typos.

Closes #20690

tests/libtest/lib2405.c

@@ -322,7 +322,7 @@ static CURLcode empty_multi_test(void)
 
   multi_init(multi);
 
-  /* calling curl_multi_waitfds() on an empty multi handle.  */
+  /* calling curl_multi_waitfds() on an empty multi handle. */
   mresult = curl_multi_waitfds(multi, ufds, 10, &fd_count);
 
   if(mresult != CURLM_OK) {

tests/libtest/mk-lib1521.pl

@@ -330,15 +330,15 @@ static bool bad_long(CURLcode res, int check)
 static bool bad_neg(int check)
 {
   switch(check) {
-    case CURLOPT_DNS_CACHE_TIMEOUT:
-    case CURLOPT_INFILESIZE:
-    case CURLOPT_INFILESIZE_LARGE:
-    case CURLOPT_MAXREDIRS:
-    case CURLOPT_POSTFIELDSIZE:
-    case CURLOPT_POSTFIELDSIZE_LARGE:
-    case CURLOPT_RESUME_FROM:
-    case CURLOPT_RESUME_FROM_LARGE:
-      return TRUE;
+  case CURLOPT_DNS_CACHE_TIMEOUT:
+  case CURLOPT_INFILESIZE:
+  case CURLOPT_INFILESIZE_LARGE:
+  case CURLOPT_MAXREDIRS:
+  case CURLOPT_POSTFIELDSIZE:
+  case CURLOPT_POSTFIELDSIZE_LARGE:
+  case CURLOPT_RESUME_FROM:
+  case CURLOPT_RESUME_FROM_LARGE:
+    return TRUE;
   }
   return FALSE;
 }

tests/libtest/test613.pl

@@ -146,7 +146,7 @@ elsif($ARGV[0] eq "postprocess") {
         }
         close(IN);
 
-        @canondir = sort {substr($a,57) cmp substr($b,57)} @canondir;
+        @canondir = sort {substr($a, 57) cmp substr($b, 57)} @canondir;
         my $newfile = $logfile . ".new";
         open(OUT, ">$newfile") || die "$!";
         print OUT join('', @canondir);