All postinstalls should run on host.
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=6e0a057f0cf55afdd385149d4aa73549d191d4db http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=2b2416098eaf6f98ebe22c86e550d648edcb90f2