patch 8.1.1818: unused variable

Problem:    Unused variable.
Solution:   Remove the variable. (Mike Williams)
diff --git a/src/sound.c b/src/sound.c
index c104b0d..92618a9 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -228,7 +228,6 @@
 		{
 		    typval_T	argv[3];
 		    typval_T	rettv;
-		    int		dummy;
 		    char	buf[32];
 
 		    vim_snprintf(buf, sizeof(buf), "close sound%06ld",
diff --git a/src/version.c b/src/version.c
index 287775f..8537df1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1818,
+/**/
     1817,
 /**/
     1816,