Add -fPIC flag to libcapnp build
Add -fPIC flag to libcapnp build

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