Apply iwyu suggestion in core.

core/string/node_path.cpp

@@ -30,7 +30,7 @@
 
 #include "node_path.h"
 
-#include "core/string/print_string.h"
+#include "core/variant/variant.h"
 
 void NodePath::_update_hash_cache() const {
 	uint32_t h = data->absolute ? 1 : 0;

core/string/print_string.cpp

@@ -33,8 +33,6 @@
 #include "core/core_globals.h"
 #include "core/os/os.h"
 
-#include <stdio.h>
-
 static PrintHandlerList *print_handler_list = nullptr;
 
 void add_print_handler(PrintHandlerList *p_handler) {

core/string/ustring.cpp

@@ -34,7 +34,6 @@
 #include "core/math/color.h"
 #include "core/math/math_funcs.h"
 #include "core/object/object.h"
-#include "core/os/memory.h"
 #include "core/string/print_string.h"
 #include "core/string/string_name.h"
 #include "core/string/translation_server.h"

core/string/ustring.h

@@ -39,8 +39,6 @@
 #include "core/typedefs.h"
 #include "core/variant/array.h"
 
-#include <utility>
-
 /*************************************************************************/
 /*  Utility Functions                                                    */
 /*************************************************************************/