Fix feature = "cargo-clippy" deprecation

Author: rex4539

qmetaobject/src/lib.rs

@@ -151,8 +151,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
 #![recursion_limit = "10240"]
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::needless_pass_by_value))] // Too many of that for qt types. (FIXME)
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::cognitive_complexity))]
+#![allow(clippy::needless_pass_by_value)] // Too many of that for qt types. (FIXME)
+#![allow(clippy::cognitive_complexity)]
 
 #[doc(hidden)]
 pub use qmetaobject_impl::{qrc_internal, SimpleListItem};
@@ -511,7 +511,7 @@ impl<'pin, T: QObject + ?Sized + 'pin> QObjectPinned<'pin, T> {
     /// Borrow the object
     // FIXME: there are too many cases for which we want reentrance after borrowing
     //pub fn borrow(&self) -> std::cell::Ref<T> { self.0.borrow() }
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::should_implement_trait))]
+    #[allow(clippy::should_implement_trait)]
     pub fn borrow(&self) -> &T {
         unsafe { &*self.0.as_ptr() }
     }

qmetaobject/src/scenegraph.rs

@@ -74,7 +74,7 @@ cpp! {{
 /// for [`SGNode<ContainerNode>::update_static`].
 ///
 /// Do not reimplement
-#[cfg_attr(feature = "cargo-clippy", allow(clippy::len_without_is_empty))]
+#[allow(clippy::len_without_is_empty)]
 pub trait UpdateNodeFnTuple<T> {
     fn len(&self) -> u64;
     unsafe fn update_fn(&self, i: u64, _: *mut c_void) -> *mut c_void;

qmetaobject_impl/src/lib.rs

@@ -19,8 +19,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //! This crates implement the custom derive used by the `qmetaobject` crate.
 
 #![recursion_limit = "256"]
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::unreadable_literal))] // Because we copy-paste constants from Qt
-#![cfg_attr(feature = "cargo-clippy", allow(clippy::cognitive_complexity))]
+#![allow(clippy::unreadable_literal)] // Because we copy-paste constants from Qt
+#![allow(clippy::cognitive_complexity)]
 
 use proc_macro::TokenStream;
 use quote::{quote, ToTokens};