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

acinclude.m4

@@ -1168,7 +1168,7 @@ AS_HELP_STRING([--without-ca-path], [Do not use a default CA path]),
     dnl --with-ca-path given
     capath="$want_capath"
     ca="no"
-  elif test "x$ca_native" != "xno"; then
+  elif test "$ca_native" != "no"; then
     # native ca configured, do not look further
     ca="no"
     capath="no"