Fix dir creation in darwin libffi targets
Fix dir creation in darwin libffi targets

ferventcoder/ffi,MikaelSmith/ffi,MikaelSmith/ffi,ffi/ffi,sparkchaser/ffi,tduehr/ffi,majioa/ffi,ferventcoder/ffi,yghannam/ffi,MikaelSmith/ffi,sparkchaser/ffi,ferventcoder/ffi,sparkchaser/ffi,yghannam/ffi,yghannam/ffi,tduehr/ffi,yghannam/ffi,ffi/ffi,tduehr/ffi,majioa/ffi,yghannam/ffi,mvz/ffi,ferventcoder/ffi,ffi/ffi,mvz/ffi,mvz/ffi,majioa/ffi,mvz/ffi,sparkchaser/ffi,majioa/ffi,tduehr/ffi,MikaelSmith/ffi