Issue #22770: Prevent some Tk segfaults on OS X when running gui tests.
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)

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branch : 2.7
Issue #17896: Move Windows external lib sources from .. to externals.

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branch : 2.7
#22751: fix test___all__ warning about modified environment in the tests.  Patch by Michael Cetrulo.

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branch : 2.7
extra : source : 37ed6eed05956e03a41fed53ce8df5e1c60cd85b
Issue #22775: Fixed unpickling of Cookie.SimpleCookie with protocol 2.
Patch by Tim Graham.

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branch : 2.7