configure: Fix build on debian by avoiding bashisms in the test command.
configure: Fix build on debian by avoiding bashisms in the test command.

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