srandom/random on epiphany

[Joel Sherrill]

Hi

libc/machine/epiphany/machine/stdlib.h defines random and srandom
as simple wrappers for other methods. It does not support the
setstate() or initstate() method.

This is the only place in newlib random/srandom appear.

This causes some issues in third-party code parted to RTEMS.

Should this type of generic code be in a machine port?

My quick solution is to wrap this in a ifndef __rtems__ but
it seems more wrong than just something which impacts us.

Also there is no license/copyright header on this file.

Thoughts?

--joel