Also copy over cputicks.go, env_posix.go, vdso_none.go, stubs2.go, and a
    part of os_linux.go.  Remove the corresponding functions from the C code
    in libgo/go/runtime.  Add some transitional support functions to
    stubs.go.  This converts several minor functions from C to Go.
    
    Reviewed-on: https://go-review.googlesource.com/29962

From-SVN: r240609