[Distutils] deprecating pip install --target

[Mark Niedzielski]

A new, important, use of --target is in creating installation bundles
for AWS Lambda functions using a Python runtime.  AWS expects a zip file
containing the primary source file and all dependent packages.  'pip
install -t' creates exactly the structure needed.  Further, because a
'pip install -t .' has the same behavior as a 'npm install' we can
easily use the same packaging code for Python and Node Lambda function
bundles.

Thanks.

-Mark

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