_testconsole.c: Fix casing & path sep

Author: longnguyen2004

PC/_testconsole.c

@@ -10,7 +10,7 @@
 #ifdef MS_WINDOWS
 
 #include "pycore_fileutils.h"     // _Py_get_osfhandle()
-#include "..\modules\_io\_iomodule.h"
+#include "../Modules/_io/_iomodule.h"
 
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
@@ -108,7 +108,7 @@ _testconsole_read_output_impl(PyObject *module, PyObject *file)
     Py_RETURN_NONE;
 }
 
-#include "clinic\_testconsole.c.h"
+#include "clinic/_testconsole.c.h"
 
 PyMethodDef testconsole_methods[] = {
     _TESTCONSOLE_WRITE_INPUT_METHODDEF