Skip threading tests for pypy builds of pycapnp
Skip threading tests for pypy builds of pycapnp

jparyani/pycapnp,SymbiFlow/pycapnp,rcrowder/pycapnp,SymbiFlow/pycapnp,rcrowder/pycapnp,jparyani/pycapnp,SymbiFlow/pycapnp,tempbottle/pycapnp,tempbottle/pycapnp,SymbiFlow/pycapnp,jparyani/pycapnp,tempbottle/pycapnp,tempbottle/pycapnp,rcrowder/pycapnp,rcrowder/pycapnp,jparyani/pycapnp