Fix building grovel-wrappers on Windows
Fix building grovel-wrappers on Windows

Don't use -fPIC on those systems

kingcheez/cffi-cheez,dochang/cffi,akovalenko/cffi,stassats/cffi,3b/cffi,cffi/cffi,3b/cffi,dkochmanski/cffi,dkochmanski/cffi,attila-lendvai/cffi,dochang/cffi,dkochmanski/cffi,stassats/cffi,3b/cffi,kingcheez/cffi-cheez,kingcheez/cffi-cheez,dochang/cffi,mcna/cffi,cffi/cffi,akovalenko/cffi,akovalenko/cffi,mcna/cffi,attila-lendvai/cffi,stassats/cffi,cffi/cffi