fix windows test failures

Signed-off-by: Matt Wrock <[email protected]>

Author: mwrock

components/win-users/src/sid.rs

@@ -172,7 +172,7 @@ impl Sid {
             let mut buffer =
                 Vec::<std::mem::MaybeUninit<u8>>::with_capacity(dw_buffer_size as usize);
             buffer.set_len(dw_buffer_size as usize);
-            let p_token_user: PTOKEN_USER = std::mem::transmute_copy(&buffer);
+            let p_token_user = buffer.as_mut_ptr() as PTOKEN_USER;
 
             cvt(GetTokenInformation(token,
                                     TokenUser,