Fix Long Numeric Integer representation for Python 3

Before Python 3, long integers were input with an L suffix. Since
Python 3, all integers are 64-bit and do not need the L suffix.

pyc_numeric.h

@@ -37,7 +37,7 @@ public:
     int size() const { return m_size; }
     const std::vector<int>& value() const { return m_value; }
 
-    std::string repr() const;
+    std::string repr(PycModule* mod) const;
 
 private:
     int m_size;