Remove obsolete Python version check

The checked version is already the current minimum supported version
(3.2).

Discussion: https://www.postgresql.org/message-id/flat/ee410de1-1e0b-4770-b125-eeefd4726a24@eisentraut.org

src/pl/plpython/plpy_exec.c

@@ -1066,13 +1066,7 @@ PLy_procedure_call(PLyProcedure *proc, const char *kargs, PyObject *vargs)
 
 	PG_TRY();
 	{
-#if PY_VERSION_HEX >= 0x03020000
-		rv = PyEval_EvalCode(proc->code,
-							 proc->globals, proc->globals);
-#else
-		rv = PyEval_EvalCode((PyCodeObject *) proc->code,
-							 proc->globals, proc->globals);
-#endif
+		rv = PyEval_EvalCode(proc->code, proc->globals, proc->globals);
 
 		/*
 		 * Since plpy will only let you close subtransactions that you