Update FFI example.
-(def ffi/loc "ffitest/so.so")
-(def ffi/source-loc "ffitest/so.c")
+(def ffi/loc "examples/ffi/so.so")
+(def ffi/source-loc "examples/ffi/so.c")
(os/execute ["cc" ffi/source-loc "-shared" "-o" ffi/loc] :px)
(def module (ffi/native ffi/loc))
