patch 8.2.0587: compiler warning for unused variable

Problem:    Compiler warning for unused variable.
Solution:   Add UNUSED.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index cc7139d..c70a433 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -4783,7 +4783,7 @@
  * to "cmd_start" or has a white space character before it.
  */
     int
-ends_excmd2(char_u *cmd_start, char_u *cmd)
+ends_excmd2(char_u *cmd_start UNUSED, char_u *cmd)
 {
     int c = *cmd;
 
diff --git a/src/version.c b/src/version.c
index 5ff481f..f95b2a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    587,
+/**/
     586,
 /**/
     585,