make makefile work for darwin
make makefile work for darwin

indirectly we make use of the github.com/sevlyar/go-daemon dependency,
which on darwin requires the use of some C code,
luckily this is only used for devevelopment by some developers,
so this isn't an issue at all.

GlenDC/zerodisk,zero-os/0-Disk,zero-os/0-Disk,GlenDC/zerodisk