Update X509NamePrintFlags to new bitflags version

bitflags no longer derives traits by default, so `Clone, Copy,
PartialEq, Eq` need to be derived outside the macro, per
<https://docs.rs/bitflags/2.5.0/bitflags/#custom-derives>.

Signed-off-by: Ross Williams <ross@ross-williams.net>

openssl/src/x509/mod.rs

@@ -61,9 +61,12 @@ pub unsafe trait ExtensionType {
     type Output: ForeignType;
 }
 
+/// Flags used to print an `X509NameRef`
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct X509NamePrintFlags(c_ulong);
+
 bitflags! {
-    /// Flags used to print an `X509NameRef`
-    pub struct X509NamePrintFlags: c_ulong {
+    impl X509NamePrintFlags: c_ulong {
         // TODO: by OpenSSL version?
         const COMPAT = ffi::XN_FLAG_COMPAT;
         const SEP_COMMA_PLUS = ffi::XN_FLAG_SEP_COMMA_PLUS;