Adding killunsel patch

patch/killunsel.c

@@ -0,0 +1,22 @@
+void
+killunsel(const Arg *arg)
+{
+	Client *i = NULL;
+
+	if (!selmon->sel)
+		return;
+
+	for (i = selmon->clients; i; i = i->next) {
+		if (ISVISIBLE(i) && i != selmon->sel) {
+			if (!sendevent(i, wmatom[WMDelete])) {
+				XGrabServer(dpy);
+				XSetErrorHandler(xerrordummy);
+				XSetCloseDownMode(dpy, DestroyAll);
+				XKillClient(dpy, i->win);
+				XSync(dpy, False);
+				XSetErrorHandler(xerror);
+				XUngrabServer(dpy);
+			}
+		}
+	}
+}