tests: Make wayland-scanner strict

Pass --strict to wayland-scanner in order to make it exit with failure
if something wasn't correct.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Simon Ser <contact@emersion.fr>

tests/scan.sh

@@ -5,7 +5,7 @@ if [ "x$SCANNER" = "x" ] ; then
 	exit 77
 fi
 
-$SCANNER client-header $1 /dev/null
-$SCANNER server-header $1 /dev/null
-$SCANNER private-code $1 /dev/null
-$SCANNER public-code $1 /dev/null
+$SCANNER client-header --strict $1 /dev/null
+$SCANNER server-header --strict $1 /dev/null
+$SCANNER private-code --strict $1 /dev/null
+$SCANNER public-code --strict $1 /dev/null