src: workaround AIX libc++ std::filesystem bug

On AIX libc++ is returning `EEXIST` instead of `EACCES` when using
`std::filesystem::remove_all()` without appropriate permissions to
recursively remove the directory.

Co-authored-by: Abdirahim Musse <[email protected]>
Signed-off-by: Richard Lau <[email protected]>

Author: richardlau

src/node_file.cc

@@ -1833,7 +1833,14 @@ static void RmSync(const FunctionCallbackInfo<Value>& args) {
   } else if (error == std::errc::not_a_directory) {
     std::string message = "Not a directory: " + file_path_str;
     return env->ThrowErrnoException(ENOTDIR, "rm", message.c_str(), path_c_str);
+#ifdef _AIX
+  // Workaround for clang libc++ bug on AIX: std::filesystem::remove_all()
+  // incorrectly returns EEXIST (17) instead of EACCES (13) for permission
+  // errors when trying to remove directories without proper permissions.
+  } else if (error == std::errc::permission_denied || error == std::errc::file_exists) {
+#else
   } else if (error == std::errc::permission_denied) {
+#endif
     std::string message = "Permission denied: " + file_path_str;
     return env->ThrowErrnoException(
         permission_denied_error, "rm", message.c_str(), path_c_str);