Fix the so suffix on PyPy
Fix the so suffix on PyPy

alex/pynacl,lmctv/pynacl,reaperhulk/pynacl,scholarly/pynacl,scholarly/pynacl,JackWink/pynacl,lmctv/pynacl,alex/pynacl,xueyumusic/pynacl,ucoin-io/cutecoin,reaperhulk/pynacl,JackWink/pynacl,xueyumusic/pynacl,ucoin-io/cutecoin,ucoin-io/cutecoin,dstufft/pynacl,Insoleet/cutecoin,dstufft/pynacl,pyca/pynacl,dstufft/pynacl,lmctv/pynacl,xueyumusic/pynacl,scholarly/pynacl,reaperhulk/pynacl,reaperhulk/pynacl,JackWink/pynacl,ucoin-bot/cutecoin,hoffmabc/pynacl,alex/pynacl,xueyumusic/pynacl,alex/pynacl,hoffmabc/pynacl,JackWink/pynacl,pyca/pynacl,pyca/pynacl,hoffmabc/pynacl,reaperhulk/pynacl,dstufft/pynacl,lmctv/pynacl,pyca/pynacl,scholarly/pynacl,pyca/pynacl,lmctv/pynacl