libyang CHANGE headers includes cleanup using include-what-you-use tool (#1098)

diff --git a/src/printer_xml.c b/src/printer_xml.c
index 2e5182e..d63b16c 100644
--- a/src/printer_xml.c
+++ b/src/printer_xml.c
@@ -13,18 +13,21 @@
  *     https://opensource.org/licenses/BSD-3-Clause
  */
 
-#include "common.h"
-
+#include <assert.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
-#include <assert.h>
 
+#include "common.h"
+#include "context.h"
+#include "dict.h"
 #include "log.h"
 #include "plugins_types.h"
+#include "printer.h"
 #include "printer_data.h"
 #include "printer_internal.h"
+#include "set.h"
 #include "tree.h"
-#include "tree_data.h"
 #include "tree_schema.h"
 #include "xml.h"