Fix fuzz build

fuzz/fuzz_targets/red_knot_check_invalid_syntax.rs

@@ -10,7 +10,7 @@ use libfuzzer_sys::{fuzz_target, Corpus};
 use red_knot_python_semantic::types::check_types;
 use red_knot_python_semantic::{
     default_lint_registry, lint::RuleSelection, Db as SemanticDb, Program, ProgramSettings,
-    PythonVersion, SearchPathSettings,
+    PythonPlatform, PythonVersion, SearchPathSettings,
 };
 use ruff_db::files::{system_path_to_file, File, Files};
 use ruff_db::system::{DbWithTestSystem, System, SystemPathBuf, TestSystem};
@@ -112,6 +112,7 @@ fn setup_db() -> TestDb {
         &db,
         &ProgramSettings {
             python_version: PythonVersion::default(),
+            python_platform: PythonPlatform::default(),
             search_paths: SearchPathSettings::new(src_root),
         },
     )