sys-fs/udev-210.ebuild updated.

Synch'ed with Gentoo version:
 * Block sys-apps/gentoo-systemd-integration because of
   /lib/udev/rules.d/40-gentoo.rules file collision.

 * Disable -flto because it's an optimization that breaks distcc, hinders
   debug info and is causing sys-apps/portage to print bogus QA warning
   wrt #502950

 * Use ROOT variable consitently everywhere. Thanks to floppym for pointing
   it out, from systemd's ebuild