Only include C11 thread library functions when targeting pthreads

Author: kleisauke

tools/system_libs.py

@@ -774,16 +774,7 @@ def get_files(self):
 
     libc_files += files_in_path(
         path_components=['system', 'lib', 'libc', 'musl', 'src', 'thread'],
-        filenames=[
-          'pthread_self.c',
-          # C11 thread library functions
-          'thrd_create.c',
-          'thrd_exit.c',
-          'thrd_join.c',
-          'thrd_sleep.c',
-          'thrd_yield.c',
-          'call_once.c',
-        ])
+        filenames=['pthread_self.c'])
 
     libc_files += glob_in_path(['system', 'lib', 'libc', 'compat'], '*.c')
 
@@ -833,6 +824,13 @@ def get_files(self):
           'pthread_getattr_np.c',
           'default_attr.c',
           'lock_ptc.c',
+          # C11 thread library functions
+          'thrd_create.c',
+          'thrd_exit.c',
+          'thrd_join.c',
+          'thrd_sleep.c',
+          'thrd_yield.c',
+          'call_once.c',
         ])
       libc_files += files_in_path(
         path_components=['system', 'lib', 'pthread'],