XEP-0092: Add configuration option to choose whether to send OS name

`/os on|off` now let's one choose whether to include the OS name once
`/software` (XEP-0092) is ran on us.

src/ui/console.c

@@ -2011,6 +2011,16 @@ cons_color_setting(void)
     }
 }
 
+void
+cons_os_setting(void)
+{
+    if (prefs_get_boolean(PREF_REVEAL_OS)) {
+        cons_show("Reveal OS name when asked for software version (XEP-0092) (/os)    : ON");
+    } else {
+        cons_show("Reveal OS name when asked for software version (XEP-0092) (/os)    : OFF");
+    }
+}
+
 void
 cons_show_connection_prefs(void)
 {