Fix icon declarations.

They can't be both extern and static...
diff --git a/contiki/apps/editor-dsc.c b/contiki/apps/editor-dsc.c
index 1865a85..59d5ba3 100644
--- a/contiki/apps/editor-dsc.c
+++ b/contiki/apps/editor-dsc.c
@@ -35,7 +35,6 @@
 
 #include "dsc.h"
 
-extern struct ctk_icon editor_icon;
 /*-----------------------------------------------------------------------------------*/
 DSC(editor_dsc,
     "A simple text editor",
@@ -70,5 +69,7 @@
 #if CTK_CONF_ICONS
 static struct ctk_icon editor_icon =
   {CTK_ICON("Editor", editoricon_bitmap, editoricon_textmap)};
+#else
+extern struct ctk_icon editor_icon;
 #endif /* CTK_CONF_ICONS */
 /*-----------------------------------------------------------------------------------*/