Add new var_Change action: VLC_VAR_SETISCOMMAND. Previously it was only

possible to set this attribute at variable creation time (and for some
reason I don't understand that didn't work in one case so I added this
work arround :p)

include/vlc_variables.h

@@ -106,6 +106,8 @@
 
 #define VLC_VAR_INHERITVALUE        0x0030
 #define VLC_VAR_TRIGGER_CALLBACKS   0x0035
+
+#define VLC_VAR_SETISCOMMAND        0x0040
 /**@}*/
 
 /*****************************************************************************

src/misc/variables.c

@@ -710,6 +710,10 @@ int __var_Change( vlc_object_t *p_this, const char *psz_name,
             }
             break;
 
+        case VLC_VAR_SETISCOMMAND:
+            p_var->i_type |= VLC_VAR_ISCOMMAND;
+            break;
+
         default:
             break;
     }