Patch by Tim Graham.

#22751: fix test___all__ warning about modified environment in the tests.  Patch by Michael Cetrulo.

When running tests in subprocesses with the regrtest -j option, a bug
in Cocoa Tk can result in a Tcl segfault.  Avoid the problem by forcing
Tk to fully initialize as an OS X gui process before destroying the
Tcl instance and creating another. (Original patch by Serhiy Storchaka)

(issue #19329).  This is needed to apply the patch from issue #17381.

locale-dependent regular expressions taking into account the locale.

This allows use with special filesystems such as VirtualBox shared folders.