patch 9.0.1336: functions without arguments are not always declared properly
Problem: Functions without arguments are not always declared properly.
Solution: Use "(void)" instead of "()". (Yegappan Lakshmanan, closes #12031)
diff --git a/src/highlight.c b/src/highlight.c
index 79501d2..6716da0 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -469,7 +469,7 @@
* the user to override the color values. Only loaded once.
*/
static void
-load_default_colors_lists()
+load_default_colors_lists(void)
{
// Lacking a default color list isn't the end of the world but it is likely
// an inconvenience so users should know when it is missing.