Package libpypy-c.dylib on OSX.

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-297 into branch/default

Created originally on Bitbucket by larstiq (Wouter van Heijst)

Was already merged in Bitbucket before import, marked as merged by the import user

The current osx nightlies are broken because they don't distribute libpypy-c.dylib, this fixes that.

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