bpo-40867: Remove unused include from Module/_randommodule.c (GH-20635)

diff --git a/Modules/_randommodule.c b/Modules/_randommodule.c
index 3589173..3e3139e 100644
--- a/Modules/_randommodule.c
+++ b/Modules/_randommodule.c
@@ -67,7 +67,6 @@
 /* ---------------------------------------------------------------*/
 
 #include "Python.h"
-#include "pycore_byteswap.h"      // _Py_bswap32()
 #ifdef HAVE_PROCESS_H
 #  include <process.h>            // getpid()
 #endif