syscall: add support for GOOS=solaris

These are only the new files, autogenerated files are in a
different CL to keep the size down.

LGTM=dave, minux.ma, jsing
R=golang-codereviews, dave, jsing, gobot, minux.ma, rsc, iant, mikioh.mikioh
CC=golang-codereviews
https://golang.org/cl/36000043
14 files changed