Makefile.am: The rpi backend needs libsession-helper.la
Makefile.am: The rpi backend needs libsession-helper.la

Signed-off-by: Marco Barisione <639ccb330e447f09edf10a157c37a3371ae75010@collabora.co.uk>

Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,krezovic/weston,Gnurou/weston,kwm81/weston,Gnurou/weston,eyolfson/weston,udoprog/weston,Tarnyko/weston-xdg_surface_present,mchalupa/weston,Fantu/compositor-spice,Fantu/compositor-spice,jonnylamb/weston,mchalupa/weston,giucam/weston,xorgy/weston,jonnylamb/weston,sir-murray/weston,xorgy/weston,eyolfson/weston,giucam/weston,kwm81/weston,sir-murray/weston,krezovic/weston,udoprog/weston