Fix up duplicate derives with extra_traits

Author: bossmc

src/unix/linux_like/linux/mod.rs

@@ -843,6 +843,7 @@ cfg_if! {
             }
         }
 
+        #[cfg(not(target_env = "musl"))]
         impl PartialEq for dirent64 {
             fn eq(&self, other: &dirent64) -> bool {
                 self.d_ino == other.d_ino
@@ -857,8 +858,10 @@ cfg_if! {
             }
         }
 
+        #[cfg(not(target_env = "musl"))]
         impl Eq for dirent64 {}
 
+        #[cfg(not(target_env = "musl"))]
         impl ::fmt::Debug for dirent64 {
             fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                 f.debug_struct("dirent64")
@@ -871,6 +874,7 @@ cfg_if! {
             }
         }
 
+        #[cfg(not(target_env = "musl"))]
         impl ::hash::Hash for dirent64 {
             fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                 self.d_ino.hash(state);