ADD CPPFLAGS and LDFLAGS

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-162 into branch/default

Created originally on Bitbucket by squeaky

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

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PyPy's distutils unlike CPython ignores CPPFLAGS and LDFLAGS.

This in turn affects CFFI.

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