Add platform-specific conditions for readonly tests

- Skip --force and --remove-destination tests on Windows (options not implemented)
- Skip --reflink tests on Windows (only supported on Linux and macOS)
- Tests now run only on platforms where the features are available
- Maintains comprehensive test coverage while respecting platform limitations

Author: naoNao89

tests/by-util/test_cp.rs

@@ -4092,6 +4092,7 @@ fn test_cp_readonly_dest_regression() {
 }
 
 /// Test readonly destination behavior with --force flag (should succeed)
+#[cfg(not(windows))]
 #[test]
 fn test_cp_readonly_dest_with_force() {
     let ts = TestScenario::new(util_name!());
@@ -4111,6 +4112,7 @@ fn test_cp_readonly_dest_with_force() {
 }
 
 /// Test readonly destination behavior with --remove-destination flag (should succeed)
+#[cfg(not(windows))]
 #[test]
 fn test_cp_readonly_dest_with_remove_destination() {
     let ts = TestScenario::new(util_name!());
@@ -4130,6 +4132,7 @@ fn test_cp_readonly_dest_with_remove_destination() {
 }
 
 /// Test readonly destination behavior with reflink options
+#[cfg(any(target_os = "linux", target_os = "macos"))]
 #[test]
 fn test_cp_readonly_dest_with_reflink() {
     let ts = TestScenario::new(util_name!());