[3.7] bpo-33053: -m now adds *starting* directory to sys.path (GH-6231) #6236
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Historically, -m added the empty string as sys.path
zero, meaning it resolved imports against the current
working directory, the same way -c and the interactive
prompt do.
This changes the sys.path initialisation to add the
starting working directory as sys.path[0] instead,
such that changes to the working directory while the
program is running will have no effect on imports
when using the -m switch.
(cherry picked from commit d5d9e02)
https://bugs.python.org/issue33053