mu: don't use __FUNCTION__, use __func__

__FUNCTION__ is deprecated and gives compilation warnings. __func__ is
standardized in c99.

toys/mug/mu-msg-attach-view.c

@@ -253,7 +253,7 @@ each_part (MuMsg *msg, MuMsgPart *part, CBData *cbdata)
 	pixbuf = mu_widget_util_get_icon_pixbuf_for_content_type (ctype, 16);
 	if (!pixbuf) {
 		g_debug ("%s: could not get icon pixbuf for '%s'",
-			 __FUNCTION__, ctype);
+			 __func__, ctype);
 		pixbuf = mu_widget_util_get_icon_pixbuf_for_content_type
 			("application/octet-stream", 16);
 	}

toys/mug/mu-msg-body-view.c

@@ -110,7 +110,7 @@ save_file_for_cid (MuMsg *msg, const char* cid)
 
 	idx = mu_msg_find_index_for_cid (msg, MU_MSG_OPTION_NONE, cid);
 	if (idx < 0) {
-		g_warning ("%s: cannot find %s", __FUNCTION__, cid);
+		g_warning ("%s: cannot find %s", __func__, cid);
 		return NULL;
 	}
 
@@ -124,7 +124,7 @@ save_file_for_cid (MuMsg *msg, const char* cid)
 	rv = mu_msg_part_save (msg, MU_MSG_OPTION_USE_EXISTING,
 			       filepath, idx, &err);
 	if (!rv) {
-		g_warning ("%s: failed to save %s: %s", __FUNCTION__, filepath,
+		g_warning ("%s: failed to save %s: %s", __func__, filepath,
 			   err&&err->message?err->message:"error");
 		g_clear_error (&err);
 		g_free (filepath);
@@ -193,7 +193,7 @@ on_resource_request_starting (MuMsgBodyView *self, WebKitWebFrame *frame,
 	msg = self->_priv->_msg;
 	uri = webkit_network_request_get_uri (request);
 
-	/* g_warning ("%s: %s", __FUNCTION__, uri); */
+	/* g_warning ("%s: %s", __func__, uri); */
 
 	if (g_ascii_strncasecmp (uri, "cid:", 4) == 0) {
 		gchar *filepath;

toys/mug/mug-msg-list-view.c

@@ -382,7 +382,7 @@ add_row (GtkTreeStore * store, MuMsg *msg, GtkTreeIter *treeiter)
 	/* 	if (!gtk_tree_model_get_iter_from_string (GTK_TREE_MODEL(store), */
 	/* 						  &myiter, path)) */
 	/* 		g_warning ("%s: cannot get iter for %s",
-	 * 		__FUNCTION__, path); */
+	 * 		__func__, path); */
 	/* } */
 
 	gtk_tree_store_set (store, treeiter,