libnm-core: add NMSetting{6Lowpan,Wpan}Class to a public header

This was an accidental ommission.

libnm-core/nm-setting-6lowpan.c

@@ -39,9 +39,9 @@ struct _NMSetting6Lowpan {
 	NMSetting parent;
 };
 
-typedef struct {
+struct _NMSetting6LowpanClass {
 	NMSettingClass parent;
-} NMSetting6LowpanClass;
+};
 
 /**
  * SECTION:nm-setting-6lowpan

libnm-core/nm-setting-6lowpan.h

@@ -39,6 +39,8 @@ G_BEGIN_DECLS
 
 #define NM_SETTING_6LOWPAN_PARENT               "parent"
 
+typedef struct _NMSetting6LowpanClass NMSetting6LowpanClass;
+
 NM_AVAILABLE_IN_1_14
 GType nm_setting_6lowpan_get_type (void);
 NM_AVAILABLE_IN_1_14

libnm-core/nm-setting-wpan.c

@@ -53,9 +53,9 @@ struct _NMSettingWpan {
         NMSetting parent;
 };
 
-typedef struct {
+struct _NMSettingWpanClass {
         NMSettingClass parent;
-} NMSettingWpanClass;
+};
 
 /**
  * SECTION:nm-setting-wpan

libnm-core/nm-setting-wpan.h

@@ -40,6 +40,8 @@ G_BEGIN_DECLS
 #define NM_SETTING_WPAN_PAN_ID             "pan-id"
 #define NM_SETTING_WPAN_SHORT_ADDRESS      "short-address"
 
+typedef struct _NMSettingWpanClass NMSettingWpanClass;
+
 NM_AVAILABLE_IN_1_14
 GType nm_setting_wpan_get_type (void);
 NM_AVAILABLE_IN_1_14