allow windows to detect tty types

uv_fs_fstat() fails on TTYs on Windows. This commit updates
uvwasi__get_filetype_by_fd() to detect this case and map
the fd to the WASI character device type.

Refs: nodejs/node#31461

src/uv_mapping.c

@@ -249,8 +249,15 @@ uvwasi_errno_t uvwasi__get_filetype_by_fd(uv_file fd, uvwasi_filetype_t* type) {
 
   r = uv_fs_fstat(NULL, &req, fd, NULL);
   if (r != 0) {
-    *type = UVWASI_FILETYPE_UNKNOWN;
     uv_fs_req_cleanup(&req);
+
+    /* Windows can't stat a TTY. */
+    if (uv_guess_handle(fd) == UV_TTY) {
+      *type = UVWASI_FILETYPE_CHARACTER_DEVICE;
+      return UVWASI_ESUCCESS;
+    }
+
+    *type = UVWASI_FILETYPE_UNKNOWN;
     return uvwasi__translate_uv_error(r);
   }