message: Drop deprecated and unused GUARDED_VAR and PT_GUARDED_VAR annotations
diff: #define LOCKABLE __attribute__((lockable))
  #define SCOPED_LOCKABLE __attribute__((scoped_lockable))
  #define GUARDED_BY(x) __attribute__((guarded_by(x)))
  -#define GUARDED_VAR __attribute__((guarded_var))
  #define PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x)))
  -#define PT_GUARDED_VAR __attribute__((pt_guarded_var))
  #define ACQUIRED_AFTER(...) __attribute__((acquired_after(__VA_ARGS__)))
  #define ACQUIRED_BEFORE(...) __attribute__((acquired_before(__VA_ARGS__)))
  #define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__((exclusive_lock_function(__VA_ARGS__)))
  #define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__((exclusive_locks_required(__VA_ARGS__)))
  #define SHARED_LOCKS_REQUIRED(...) __attribute__((shared_locks_required(__VA_ARGS__)))
  #define NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
  -#define ASSERT_EXCLUSIVE_LOCK(...) __attribute((assert_exclusive_lock(__VA_ARGS__)))
  +#define ASSERT_EXCLUSIVE_LOCK(...) __attribute__((assert_exclusive_lock(__VA_ARGS__)))
  #else
  #define LOCKABLE
  #define SCOPED_LOCKABLE
  #define GUARDED_BY(x)
  -#define GUARDED_VAR
  #define PT_GUARDED_BY(x)
  -#define PT_GUARDED_VAR
  #define ACQUIRED_AFTER(...)
  #define ACQUIRED_BEFORE(...)
  #define EXCLUSIVE_LOCK_FUNCTION(...)
  