systemd: Updated to version 215

This is a long overdue upgrade to latest systemd version.

Tested successfully on beaglebone black with kernel 3.8.13.

The required kernel config options are now:

CONFIG_DEVTMPFS
CONFIG_CGROUPS
CONFIG_INOTIFY_USER
CONFIG_SIGNALFD
CONFIG_TIMERFD
CONFIG_EPOLL
CONFIG_NET
CONFIG_SYSFS
CONFIG_PROC_FS
CONFIG_FHANDLE
CONFIG_SYSFS_DEPRECATED=n
CONFIG_AUTOFS4_FS

See systemd README for more details on kernel options.

Note: systemd LTO compilation is disabled, seems plain broken for cross builds.