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/ftp.c

@@ -637,7 +637,7 @@ static CURLcode getftpresponse(struct Curl_easy *data,
    * the OpenSSL read() does not grok that properly.
    *
    * Alas, read as much as possible, split up into lines, use the ending
-   * line in a response or continue reading.  */
+   * line in a response or continue reading. */
 
   struct connectdata *conn = data->conn;
   curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
@@ -1801,7 +1801,7 @@ static CURLcode ftp_state_retr(struct Curl_easy *data,
     }
     else {
       /* We got a file size report, so we check that there actually is a
-         part of the file left to get, or else we go home.  */
+         part of the file left to get, or else we go home. */
       if(data->state.resume_from < 0) {
         /* We are supposed to download the last abs(from) bytes */
         if(filesize < -data->state.resume_from) {