Add newlines to end of print statements in tests. NFC (#17342)

Author: hoodmane

tests/core/pthread/test_pthread_dylink_longjmp.c

@@ -32,6 +32,6 @@ int main() {
   rc = pthread_join(t, NULL);
   assert(!rc);
 
-  printf("Done");
+  printf("Done\n");
   return 0;
 }

tests/cstdio/test_remove.cpp

@@ -57,7 +57,7 @@ void test() {
   err = std::remove("dir");
   assert(!err);
 
-  std::cout << "success";
+  std::cout << "success\n";
 }
 
 int main() {

tests/pthread/test_pthread_cleanup.cpp

@@ -83,7 +83,7 @@ int main() {
 //   s = pthread_cancel(thr[3]);
 //   assert(s == 0);
   pthread_cleanup_pop(1);
-  printf("Cleanup state variable: %ld", cleanupState);
+  printf("Cleanup state variable: %ld\n", cleanupState);
   assert(cleanupState == 907640832);
 
   pthread_cleanup_pop(1);

tests/test_core.py

@@ -1536,9 +1536,9 @@ def test_exceptions_uncaught_2(self):
         }
 
         if (std::uncaught_exception())
-          std::cout << "ERROR: uncaught_exception still set.";
+          std::cout << "ERROR: uncaught_exception still set.\n";
         else
-          std::cout << "OK";
+          std::cout << "OK\n";
       }
     '''
     self.do_run(src, 'OK\n')