Implement some missing pthread stub functions (#18256)

* Add some musl pthreads files to the build that will be safe to run in singlethreaded pthreads stub mode as well.

* Remove duplicate functions

* Remove duplicate line

Author: juj

system/lib/pthread/library_pthread_stub.c

@@ -287,10 +287,6 @@ int pthread_getattr_np(pthread_t thread, pthread_attr_t *attr) {
   return 0;
 }
 
-int pthread_attr_destroy(pthread_attr_t *attr) {
-  return 0;
-}
-
 int pthread_setcancelstate(int state, int* oldstate) {
   return 0;
 }
@@ -367,18 +363,6 @@ int pthread_spin_unlock(pthread_spinlock_t *lock) {
   return 0;
 }
 
-int pthread_attr_setdetachstate(pthread_attr_t* attr, int detachstate) {
-  return 0;
-}
-
-int pthread_attr_setschedparam(pthread_attr_t* attr, const struct sched_param* param) {
-  return 0;
-}
-
-int pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize) {
-  return 0;
-}
-
 int sem_init(sem_t *sem, int pshared, unsigned int value) {
   return 0;
 }

tools/system_libs.py

@@ -1015,7 +1015,21 @@ def get_files(self):
         filenames=[
           'pthread_self.c',
           'pthread_cleanup_push.c',
+          'pthread_attr_destroy.c',
           'pthread_attr_get.c',
+          'pthread_attr_setdetachstate.c',
+          'pthread_attr_setguardsize.c',
+          'pthread_attr_setinheritsched.c',
+          'pthread_attr_setschedparam.c',
+          'pthread_attr_setschedpolicy.c',
+          'pthread_attr_setscope.c',
+          'pthread_attr_setstack.c',
+          'pthread_attr_setstacksize.c',
+          'pthread_getconcurrency.c',
+          'pthread_getcpuclockid.c',
+          'pthread_getschedparam.c',
+          'pthread_setschedprio.c',
+          'pthread_setconcurrency.c',
           # C11 thread library functions
           'call_once.c',
           'tss_create.c',