```
The first and second are the standard ones; they differ only in how many
arguments can be passed to the kernel. The third is for low-level use by the
ForkExec wrapper. Unlike the first two, it does not call into the scheduler to
let it know that a system call is running.

When porting Go to a new architecture/OS, this file must be implemented for
each GOOS/GOARCH pair.

### mksysnum