Remove duplicated constants from s390x

Author: gnzlbg

src/unix/linux_like/linux/gnu/b64/s390x.rs

@@ -283,7 +283,6 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
-pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 align_const! {
     pub const PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP: ::pthread_mutex_t =