patch 9.0.1094: compiler warning when HAS_MESSAGE_WINDOW is not defined

Problem:    Compiler warning when HAS_MESSAGE_WINDOW is not defined.
Solution:   Add UNUSED.
diff --git a/src/version.c b/src/version.c
index 5c21f7a..95d2a6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1094,
+/**/
     1093,
 /**/
     1092,
diff --git a/src/vim9cmds.c b/src/vim9cmds.c
index 4fbae4f..5aa783e 100644
--- a/src/vim9cmds.c
+++ b/src/vim9cmds.c
@@ -1973,7 +1973,11 @@
  * compile "execute expr"
  */
     char_u *
-compile_mult_expr(char_u *arg, int cmdidx, long cmd_count, cctx_T *cctx)
+compile_mult_expr(
+	char_u	*arg,
+	int	cmdidx,
+	long	cmd_count UNUSED,
+	cctx_T	*cctx)
 {
     char_u	*p = arg;
     char_u	*prev = arg;