Suppress incorrect_partial_ord_impl_on_ord_type lint within generated…

… code

    warning: incorrect implementation of `partial_cmp` on an `Ord` type
      --> tests/ffi/lib.rs:27:43
       |
    27 |     #[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
       |                                           ^^^^^^^^^^ help: change this to: `{ Some(self.cmp(other)) }`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_partial_ord_impl_on_ord_type
       = note: `-W clippy::incorrect-partial-ord-impl-on-ord-type` implied by `-W clippy::all`

    warning: incorrect implementation of `partial_cmp` on an `Ord` type
      --> tests/ffi/lib.rs:37:27
       |
    37 |     #[derive(Debug, Hash, PartialOrd, Ord)]
       |                           ^^^^^^^^^^ help: change this to: `{ Some(self.cmp(other)) }`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_partial_ord_impl_on_ord_type

    warning: incorrect implementation of `partial_cmp` on an `Ord` type
      --> tests/ffi/lib.rs:89:69
       |
    89 |     #[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
       |                                                                     ^^^^^^^^^^ help: change this to: `{ Some(self.cmp(other)) }`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incorrect_partial_ord_impl_on_ord_type

macro/src/derive.rs

@@ -212,6 +212,7 @@ fn struct_partial_ord(strct: &Struct, span: Span) -> TokenStream {
 
     quote_spanned! {span=>
         impl #generics ::cxx::core::cmp::PartialOrd for #ident #generics {
+            #[allow(clippy::incorrect_partial_ord_impl_on_ord_type)]
             fn partial_cmp(&self, other: &Self) -> ::cxx::core::option::Option<::cxx::core::cmp::Ordering> {
                 #body
             }
@@ -280,6 +281,7 @@ fn enum_partial_ord(enm: &Enum, span: Span) -> TokenStream {
 
     quote_spanned! {span=>
         impl ::cxx::core::cmp::PartialOrd for #ident {
+            #[allow(clippy::incorrect_partial_ord_impl_on_ord_type)]
             fn partial_cmp(&self, other: &Self) -> ::cxx::core::option::Option<::cxx::core::cmp::Ordering> {
                 ::cxx::core::cmp::PartialOrd::partial_cmp(&self.repr, &other.repr)
             }