disabled randomly failing test_sys_exit

Author: tomasstupka

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_multiprocessing_spawn.txt

@@ -174,7 +174,6 @@
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestSharedMemory.test_shared_memory_cleaned_after_process_termination
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestSubclassingProcess.test_stderr_flush
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestSubclassingProcess.test_subclassing
-*graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestSubclassingProcess.test_sys_exit
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestValue.test_getobj_getlock
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestValue.test_rawvalue
 *graalpython.lib-python.3.test.test_multiprocessing_spawn.WithProcessesTestValue.test_value