Use of DeviceIoControl to obtain the symlink path via the reparse tag was
removed. The code now uses GetFinalPathNameByHandle in the case of a
symbolic link and works properly given the added test which creates a symbolic
link and calls os.stat on it from multiple locations.

Victor Stinner also noticed an issue with os.lstat following the os.stat
code path when being passed bytes. The posix_lstat function was adjusted to
properly hook up win32_lstat instead of the previous STAT macro (win32_stat).

Spawn a new process instead of using fork(). Patch written by Charles-François
Natali.

This allows findsource() to work in doctests.

A patch from Dirkjan Ochtman.

methods.

Original patch by Erik Bray.

Original patch by Erik Bray.

Original patch by Erik Bray as part of #11595, changed by me to improve
readability.

Original patch by Tshepang Lekhonkhobe.