Tweak repaint timeout to 5ms after vblank
Tweak repaint timeout to 5ms after vblank

Reduces risk of flicker, but we need something better here.

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