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/conncache.c

@@ -69,7 +69,6 @@
     }                                                                   \
   } while(0)
 
-
 /* A list of connections to the same destination. */
 struct cpool_bundle {
   struct Curl_llist conns; /* connections in the bundle */
@@ -167,7 +166,6 @@ static struct cpool_bundle *cpool_find_bundle(struct cpool *cpool,
                         conn->destination, strlen(conn->destination) + 1);
 }
 
-
 static void cpool_remove_bundle(struct cpool *cpool,
                                 struct cpool_bundle *bundle)
 {