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/http2.c

@@ -65,7 +65,7 @@
 #define H2_NW_RECV_CHUNKS       (H2_CONN_WINDOW_SIZE / H2_CHUNK_SIZE)
 /* on send into TLS, we just want to accumulate small frames */
 #define H2_NW_SEND_CHUNKS       1
-/* this is how much we want "in flight" for a stream, unthrottled  */
+/* this is how much we want "in flight" for a stream, unthrottled */
 #define H2_STREAM_WINDOW_SIZE_MAX   (10 * 1024 * 1024)
 /* this is how much we want "in flight" for a stream, initially, IFF
  * nghttp2 allows us to tweak the local window size. */
@@ -888,7 +888,6 @@ static void h2_xfer_write_resp_hd(struct Curl_cfilter *cf,
                                   struct h2_stream_ctx *stream,
                                   const char *buf, size_t blen, bool eos)
 {
-
   /* If we already encountered an error, skip further writes */
   if(!stream->xfer_result) {
     stream->xfer_result = Curl_xfer_write_resp_hd(data, buf, blen, eos);
@@ -905,7 +904,6 @@ static void h2_xfer_write_resp(struct Curl_cfilter *cf,
                                struct h2_stream_ctx *stream,
                                const char *buf, size_t blen, bool eos)
 {
-
   /* If we already encountered an error, skip further writes */
   if(!stream->xfer_result)
     stream->xfer_result = Curl_xfer_write_resp(data, buf, blen, eos);