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

lib/url.c

@@ -1844,7 +1844,7 @@ static CURLcode parseurlandfillconn(struct Curl_easy *data,
 
 #ifdef USE_IPV6
   if(data->set.scope_id)
-    /* Override any scope that was set above.  */
+    /* Override any scope that was set above. */
     conn->scope_id = data->set.scope_id;
 #endif
 
@@ -2538,7 +2538,6 @@ error:
 static CURLcode parse_remote_port(struct Curl_easy *data,
                                   struct connectdata *conn)
 {
-
   if(data->set.use_port && data->state.allow_port) {
     /* if set, we use this instead of the port possibly given in the URL */
     char portbuf[16];