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

diff --git a/tools/lint/main.c b/tools/lint/main.c
index 6b257da..d1121a0 100644
--- a/tools/lint/main.c
+++ b/tools/lint/main.c
@@ -12,7 +12,7 @@
  *     https://opensource.org/licenses/BSD-3-Clause
  */
 
-#include "config.h"
+#define _GNU_SOURCE
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -20,12 +20,16 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "commands.h"
-#include "configuration.h"
-#include "completion.h"
-#include "./linenoise/linenoise.h"
 #include "libyang.h"
 
+#include "tools/config.h"
+
+#include "commands.h"
+#include "completion.h"
+#include "configuration.h"
+#include "linenoise/linenoise.h"
+
+
 int done;
 struct ly_ctx *ctx = NULL;