cp: Enabling cp force flag to run on windows (#9624)

* Enabling cp force flag to run on windows

* Windows requires clearing the readonly permissions before deleting

src/uu/cp/src/cp.rs

@@ -987,8 +987,6 @@ impl Options {
         let not_implemented_opts = vec![
             #[cfg(not(any(windows, unix)))]
             options::ONE_FILE_SYSTEM,
-            #[cfg(windows)]
-            options::FORCE,
         ];
 
         for not_implemented_opt in not_implemented_opts {
@@ -1991,6 +1989,16 @@ fn delete_dest_if_needed_and_allowed(
 }
 
 fn delete_path(path: &Path, options: &Options) -> CopyResult<()> {
+    // Windows requires clearing readonly attribute before deletion when using --force
+    #[cfg(windows)]
+    if options.force() {
+        if let Ok(mut perms) = fs::metadata(path).map(|m| m.permissions()) {
+            #[allow(clippy::permissions_set_readonly_false)]
+            perms.set_readonly(false);
+            let _ = fs::set_permissions(path, perms);
+        }
+    }
+
     match fs::remove_file(path) {
         Ok(()) => {
             if options.verbose {

tests/by-util/test_cp.rs

@@ -11,7 +11,6 @@ use uucore::selinux::get_getfattr_output;
 use uutests::util::TestScenario;
 use uutests::{at_and_ucmd, new_ucmd, path_concat, util_name};
 
-#[cfg(not(windows))]
 use std::fs::set_permissions;
 
 use std::io::Write;
@@ -972,7 +971,6 @@ fn test_cp_arg_no_clobber_twice() {
 }
 
 #[test]
-#[cfg(not(windows))]
 fn test_cp_arg_force() {
     let (at, mut ucmd) = at_and_ucmd!();