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

lib/rtsp.c

@@ -43,7 +43,6 @@
 #include "bufref.h"
 #include "curlx/strparse.h"
 
-
 /* meta key for storing protocol meta at easy handle */
 #define CURL_META_RTSP_EASY   "meta:proto:rtsp:easy"
 /* meta key for storing protocol meta at connection */
@@ -72,7 +71,6 @@ struct RTSP {
   long CSeq_recv; /* CSeq received */
 };
 
-
 #define RTP_PKT_LENGTH(p) ((((unsigned int)((unsigned char)((p)[2]))) << 8) | \
                             ((unsigned int)((unsigned char)((p)[3]))))