Status of the different issues:
#16416, Mac OS X: 3.2, 3.3, 3.4
#16455, FreeBSD and Solaris: 3.4
#16218, set_main_loader: 3.3, 3.4
#16218, test_cmd_line_script: 3.4 (3.3 has an old copy of the test)
#16414, add support.TESTFN_NONASCII: 3.4
#16444, use support.TESTFN_NONASCII: 3.4