Fix pymain_run_stdin() in Modules/main.c to call pymain_start_pyrepl() instead of pymain_run_module(L"_pyrepl", 0)

This change is an equivalent to the one done in https://github.com/python/cpython/pull/120904/files#diff-79e40dbd94b164b5f42a960224cc7496e33c189b4c66a6810904eda7d703b6f2R600
Two callers of `pymain_start_pyrepl` differs in whether the PYTHONSTARTUP script is already executed or not, so pythonstartup argument is added to `pymain_start_pyrepl` to control whether it should be executed in it or not.

Author: whitphx

Modules/main.c

@@ -269,7 +269,7 @@ pymain_run_command(wchar_t *command)
 
 
 static int
-pymain_start_pyrepl(void)
+pymain_start_pyrepl(int pythonstartup)
 {
     int res = 0;
     PyObject *console = NULL;
@@ -306,7 +306,7 @@ pymain_start_pyrepl(void)
         goto done;
     }
     if (!PyDict_SetItemString(kwargs, "mainmodule", main_module)
-        && !PyDict_SetItemString(kwargs, "pythonstartup", _PyLong_GetOne())) {
+        && !PyDict_SetItemString(kwargs, "pythonstartup", pythonstartup ? Py_True : Py_False)) {
         console_result = PyObject_Call(console, empty_tuple, kwargs);
         if (console_result == NULL) {
             res = pymain_exit_err_print();
@@ -570,7 +570,7 @@ pymain_run_stdin(PyConfig *config)
         int run = PyRun_AnyFileExFlags(stdin, "<stdin>", 0, &cf);
         return (run != 0);
     }
-    return pymain_run_module(L"_pyrepl", 0);
+    return pymain_start_pyrepl(0);
 }
 
 
@@ -603,7 +603,7 @@ pymain_repl(PyConfig *config, int *exitcode)
         *exitcode = (run != 0);
         return;
     }
-    int run = pymain_start_pyrepl();
+    int run = pymain_start_pyrepl(1);
     *exitcode = (run != 0);
     return;
 }