patch 8.2.1745: tiny version doesn't build

Problem:    Tiny version doesn't build.
Solution:   Add dummy ex_var() function.

src/ex_docmd.c

@@ -291,6 +291,7 @@ static void	ex_tag_cmd(exarg_T *eap, char_u *name);
 # define ex_function		ex_ni
 # define ex_if			ex_ni
 # define ex_let			ex_ni
+# define ex_var			ex_ni
 # define ex_lockvar		ex_ni
 # define ex_oldfiles		ex_ni
 # define ex_options		ex_ni

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1745,
 /**/
     1744,
 /**/