- Issue #22381: Update zlib to 1.2.8.

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branch : 2.7
- Issue #22381: Update zlib to 1.2.8.

  Update zlib file names for the PC installers

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branch : 2.7
Issue #21951: Use attemptckalloc() instead of ckalloc() in Tkinter.

ckalloc() causes the Tcl interpreter to panic, attemptckalloc() returns NULL
if the memory allocation fails.

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branch : 2.7
Issue #21951: Fixed a crash in Tkinter on AIX when called Tcl command with
empty string or tuple argument.

On some platforms Tcl memory allocator returns NULL when allocating zero-sized
block of memory.

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branch : 2.7
Issue #21147: sqlite3 now raises an exception if the request contains a null
character instead of truncate it.  Based on patch by Victor Stinner.

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branch : 2.7
test_distutils: remove the test file in DistributionTestCase.test_debug_mode()

Fix the warning: "test_support.TESTFN was modified by test_distutils".

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branch : 2.7