autotools: Add configure summary
autotools: Add configure summary

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