[issue12246] Warn when trying to install third-party module from an uninstalled checkout

[Tshepang Lekhonkhobe]

Changes by Tshepang Lekhonkhobe <tshepang at gmail.com>:


Added file: http://bugs.python.org/file22277/display_warning_with_test.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12246>
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