fix nits

Author: YvesDup

Modules/_threadmodule.c

@@ -2,7 +2,6 @@
 /* Interface to Sjoerd's portable C thread library */
 
 #include "Python.h"
-//#include "pycore_critical_section.h" // Py_BEGIN_CRITICAL_SECTION(), Py_END_CRITICAL_SECTION()
 #include "pycore_fileutils.h"     // _PyFile_Flush
 #include "pycore_interp.h"        // _PyInterpreterState.threads.count
 #include "pycore_lock.h"