[3.6] bpo-31532: Fix memory corruption due to allocator mix (GH-3679) #3681
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Fix a memory corruption in getpath.c due to mixed memory allocators
between Py_GetPath() and Py_SetPath().
The fix use the Raw allocator to mimic the windows version.
This patch should be used from python3.6 to the current version
for more details, see the bug report and
pyinstaller/pyinstaller#2812
(cherry picked from commit 3d1e2ab)
https://bugs.python.org/issue31532