Fix other instances of negative one.

Cython/Utility/TypeConversion.c

@@ -603,7 +603,7 @@ static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value);
 /////////////// CIntToPy ///////////////
 
 static CYTHON_INLINE PyObject* {{TO_PY_FUNCTION}}({{TYPE}} value) {
-    const {{TYPE}} neg_one = ({{TYPE}}) -1, const_zero = ({{TYPE}}) 0;
+    const {{TYPE}} neg_one = ({{TYPE}}) (({{TYPE}}) 0 - ({{TYPE}}) 1), const_zero = ({{TYPE}}) 0;
     const int is_unsigned = neg_one > const_zero;
     if (is_unsigned) {
         if (sizeof({{TYPE}}) < sizeof(long)) {
@@ -825,7 +825,7 @@ static CYTHON_INLINE {{TYPE}} {{FROM_PY_FUNCTION}}(PyObject *);
 {{py: from Cython.Utility import pylong_join }}
 
 static CYTHON_INLINE {{TYPE}} {{FROM_PY_FUNCTION}}(PyObject *x) {
-    const {{TYPE}} neg_one = ({{TYPE}}) -1, const_zero = ({{TYPE}}) 0;
+    const {{TYPE}} neg_one = ({{TYPE}}) (({{TYPE}}) 0 - ({{TYPE}}) 1), const_zero = ({{TYPE}}) 0;
     const int is_unsigned = neg_one > const_zero;
 #if PY_MAJOR_VERSION < 3
     if (likely(PyInt_Check(x))) {