[issue12246] create installation path if it's non-existent

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Ah, I understand; I have a $srcdir/Lib/site-packages directory, but packaging wants to install into $prefix/site-packages, which does not exist.  +1 to adding a nice message.  Tshepang, would you like to update your patch?

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