Error on `make mocsy.so` on mac

Following http://ocmip5.ipsl.jussieu.fr/mocsy/pyth.html with `gfortran` and `numpy` installed, `make mocsy.so` breaks with the current Makefile.

The culprit is `cp -f -s src/$(KIND_MAP) .f2py_f2cmap` under the `mocsy.so` target. It seems like Mac doesn't have the `-s` flag. Removing that allows it to run just fine. Perhaps the symbolic linking isn't necessary? 