internal/syscall/unix: add randomTrap for sh/shbe

CL 84555 added support for the SuperH architecture, but didn't add the
randomTrap definition to be used for the getrandom syscall on Linux.
Add it now.

Change-Id: Ib1a87d15b744aef93de3a9921432e9030ed1d86d
Reviewed-on: https://go-review.googlesource.com/90535
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
1 file changed