omit a static string that’s not needed in MKSH_SMALL without vi mode

edit.c

@@ -29,7 +29,7 @@
 
 #ifndef MKSH_NO_CMDLINE_EDITING
 
-__RCSID("$MirOS: src/bin/mksh/edit.c,v 1.356 2020/10/01 22:39:56 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/edit.c,v 1.357 2020/10/31 05:02:17 tg Exp $");
 
 /*
  * in later versions we might use libtermcap for this, but since external
@@ -41,7 +41,9 @@ __RCSID("$MirOS: src/bin/mksh/edit.c,v 1.356 2020/10/01 22:39:56 tg Exp $");
 #define MKSH_CLS_STRING		KSH_ESC_STRING "[;H" KSH_ESC_STRING "[J"
 #endif
 
+#if !defined(MKSH_SMALL) || !MKSH_S_NOVI
 static const char ctrl_x_e[] = "fc -e \"${VISUAL:-${EDITOR:-vi}}\" --";
+#endif
 
 /* tty driver characters we are interested in */
 #define EDCHAR_DISABLED	0xFFFFU