mksysinfo: Fix handling of timex for ARM GNU/Linux.
mksysinfo: Fix handling of timex for ARM GNU/Linux.

R=iant
CC=gofrontend-dev
https://golang.org/cl/5813043

anlhord/gofrontend,golang/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,golang/gofrontend,anlhord/gofrontend,golang/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,golang/gofrontend,anlhord/gofrontend,anlhord/gofrontend,anlhord/gofrontend,qskycolor/gofrontend