src: use uv_guess_handle() to detect TTYs

This commit reverts #30829
and uses uv_guess_handle() instead of isatty(). The IBMi
changes are no longer required, as of libuv 1.34.1.

PR-URL: #31333
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>

src/node.cc

@@ -98,9 +98,6 @@
 #include <unistd.h>        // STDIN_FILENO, STDERR_FILENO
 #endif
 
-#ifdef __PASE__
-#include <sys/ioctl.h>  // ioctl
-#endif
 // ========== global C++ headers ==========
 
 #include <cerrno>
@@ -555,14 +552,7 @@ inline void PlatformInit() {
     while (s.flags == -1 && errno == EINTR);  // NOLINT
     CHECK_NE(s.flags, -1);
 
-#ifdef __PASE__
-    // On IBMi PASE isatty() always returns true for stdin, stdout and stderr.
-    // Use ioctl() instead to identify whether it's actually a TTY.
-    if (ioctl(fd, TXISATTY + 0x81, nullptr) == -1 && errno == ENOTTY)
-      continue;
-#else
-    if (!isatty(fd)) continue;
-#endif
+    if (uv_guess_handle(fd) != UV_TTY) continue;
     s.isatty = true;
 
     do