missing const in some pthread_attr_* prototypes

include/pthread.h

@@ -127,21 +127,21 @@ int pthread_setspecific(pthread_key_t, const void *);
 int pthread_attr_init(pthread_attr_t *);
 int pthread_attr_destroy(pthread_attr_t *);
 
-int pthread_attr_getguardsize(pthread_attr_t *, size_t *);
+int pthread_attr_getguardsize(const pthread_attr_t *, size_t *);
 int pthread_attr_setguardsize(pthread_attr_t *, size_t);
-int pthread_attr_getstacksize(pthread_attr_t *, size_t *);
+int pthread_attr_getstacksize(const pthread_attr_t *, size_t *);
 int pthread_attr_setstacksize(pthread_attr_t *, size_t);
-int pthread_attr_getdetachstate(pthread_attr_t *, int *);
+int pthread_attr_getdetachstate(const pthread_attr_t *, int *);
 int pthread_attr_setdetachstate(pthread_attr_t *, int);
-int pthread_attr_getstack(pthread_attr_t *, void **, size_t *);
+int pthread_attr_getstack(const pthread_attr_t *, void **, size_t *);
 int pthread_attr_setstack(pthread_attr_t *, void *, size_t);
-int pthread_attr_getscope(pthread_attr_t *, int *);
+int pthread_attr_getscope(const pthread_attr_t *, int *);
 int pthread_attr_setscope(pthread_attr_t *, int);
-int pthread_attr_getschedpolicy(pthread_attr_t *, int *);
+int pthread_attr_getschedpolicy(const pthread_attr_t *, int *);
 int pthread_attr_setschedpolicy(pthread_attr_t *, int);
-int pthread_attr_getschedparam(pthread_attr_t *, struct sched_param *);
+int pthread_attr_getschedparam(const pthread_attr_t *, struct sched_param *);
 int pthread_attr_setschedparam(pthread_attr_t *, const struct sched_param *);
-int pthread_attr_getinheritsched(pthread_attr_t *, int *);
+int pthread_attr_getinheritsched(const pthread_attr_t *, int *);
 int pthread_attr_setinheritsched(pthread_attr_t *, int);
 
 int pthread_mutexattr_destroy(pthread_mutexattr_t *);