manager: make NMManager's structs private

They are only useful when we want to derive a class
from NM_TYPE_MANAGER -- which we clearly don't.

src/nm-manager.c

@@ -138,6 +138,14 @@ typedef struct {
 	gboolean devices_inited;
 } NMManagerPrivate;
 
+struct _NMManager {
+	NMExportedObject parent;
+};
+
+typedef struct {
+	NMExportedObjectClass parent;
+} NMManagerClass;
+
 #define NM_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_MANAGER, NMManagerPrivate))
 
 G_DEFINE_TYPE (NMManager, nm_manager, NM_TYPE_EXPORTED_OBJECT)

src/nm-manager.h

@@ -71,14 +71,6 @@
 #define NM_MANAGER_INTERNAL_DEVICE_REMOVED   "internal-device-removed"
 
 
-struct _NMManager {
-	NMExportedObject parent;
-};
-
-typedef struct {
-	NMExportedObjectClass parent;
-} NMManagerClass;
-
 GType nm_manager_get_type (void);
 
 /* nm_manager_setup() should only be used by main.c */