[issue27869] test failures under Bash on Windows / WSL

[Brett Cannon]

Brett Cannon added the comment:

Under Creators Update with a clean Ubuntu 16.04 image and only installing clang and make, I built with `CC=clang ./configure; make -s -j` and ran with `./python -m test -j0 -x test_socket` (test_socket hung in a previous run; I let it run for 10 minutes previously):

348 tests OK.

19 tests failed:
    test_asyncio test_asyncore test_epoll test_fcntl test_ftplib
    test_httpservers test_import test_mmap test_multiprocessing_fork
    test_multiprocessing_forkserver test_multiprocessing_spawn test_os
    test_posix test_resource test_selectors test_signal
    test_subprocess test_time test_unicode_file

36 tests skipped:
    test_bz2 test_crypt test_ctypes test_curses test_dbm_gnu
    test_dbm_ndbm test_devpoll test_gdb test_gzip test_idle
    test_kqueue test_lzma test_msilib test_nis test_ossaudiodev
    test_readline test_smtpnet test_socketserver test_sqlite test_ssl
    test_startfile test_tcl test_timeout test_tix test_tk
    test_ttk_guionly test_ttk_textonly test_turtle test_urllib2net
    test_urllibnet test_winconsoleio test_winreg test_winsound
    test_xmlrpc_net test_zipfile64 test_zlib

Total duration: 3 min 56 sec
Tests result: FAILURE

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