Update test_sys.py from 3.13.11 (#6428)

* mark RustPython as  free-threaded

* Py_GIL_DISABLED

* Update `test_sys.py` from 3.13.11

* mark tests

---------

Co-authored-by: Jeong YunWon <jeong@youknowone.org>

crates/vm/src/stdlib/sys.rs

@@ -53,7 +53,7 @@ mod sys {
     const RUSTPYTHON_DEBUGBUILD: bool = cfg!(debug_assertions);
 
     #[pyattr(name = "abiflags")]
-    pub(crate) const ABIFLAGS: &str = "";
+    pub(crate) const ABIFLAGS: &str = "t"; // 't' for free-threaded (no GIL)
     #[pyattr(name = "api_version")]
     const API_VERSION: u32 = 0x0; // what C api?
     #[pyattr(name = "copyright")]
@@ -599,6 +599,11 @@ mod sys {
         // TODO: sys.audit implementation
     }
 
+    #[pyfunction]
+    const fn _is_gil_enabled() -> bool {
+        false // RustPython has no GIL (like free-threaded Python)
+    }
+
     #[pyfunction]
     fn exit(code: OptionalArg<PyObjectRef>, vm: &VirtualMachine) -> PyResult {
         let code = code.unwrap_or_none(vm);

crates/vm/src/stdlib/sysconfigdata.rs

@@ -23,6 +23,8 @@ pub(crate) mod _sysconfigdata {
             "RUST_MULTIARCH" => RUST_MULTIARCH,
             // enough for tests to stop expecting urandom() to fail after restricting file resources
             "HAVE_GETRANDOM" => 1,
+            // RustPython has no GIL (like free-threaded Python)
+            "Py_GIL_DISABLED" => 1,
             // Compiler configuration for native extension builds
             "CC" => "cc",
             "CXX" => "c++",