Bridge more musl/glibc diffs in aarch64

[cataphract]

This should cover all the differences I could find on aarch64.

Type	Glibc Size	Musl Size
pthread_t	8 bytes	8 bytes
pthread_attr_t	64 bytes	56 bytes
pthread_mutex_t	48 bytes	40 bytes
pthread_mutexattr_t	8 bytes	4 bytes
pthread_cond_t	48 bytes	48 bytes
pthread_condattr_t	8 bytes	4 bytes
pthread_rwlock_t	56 bytes	56 bytes
pthread_rwlockattr_t	8 bytes	8 bytes
pthread_barrier_t	32 bytes	32 bytes
pthread_barrierattr_t	8 bytes	4 bytes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.16%. Comparing base (2cb1071) to head (b2e44b8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   72.16%   72.16%           
=======================================
  Files          43       43           
  Lines        6040     6040           
  Branches      880      880           
=======================================
  Hits         4359     4359           
  Misses       1254     1254           
  Partials      427      427           

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