eglibc: add package 'glibc, remove package 'eglibc', switch to 'glibc' as default libc

Signed-off-by: Stephan Raue <stephan@openelec.tv>
systemd: drop double gcrypt depend
systemd: update to systemd-215
dbus-glib: update to dbus-glib-0.102

Signed-off-by: Stephan Raue <stephan@openelec.tv>
libffi: update to libffi-3.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
dbus: update to dbus-1.8.6

Signed-off-by: Stephan Raue <stephan@openelec.tv>