fix 1-arg min/max case

Cython/Compiler/Optimize.py

@@ -1723,7 +1723,7 @@ class EarlyReplaceBuiltinCalls(Visitor.EnvTransform):
         if len(args) <= 1:
             if len(args) == 1 and args[0].is_sequence_constructor:
                 args = args[0].args
-            if len(args) < 1:
+            if len(args) <= 1:
                 # leave this to Python
                 return node