Teach Python/ceval.c's inlining of 'str += str' about Py_ssize_t sizes; this
was having funny effects when called on >2Gb strings ;P
diff --git a/Python/ceval.c b/Python/ceval.c
index 4a5882c..c0d87a5 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4238,8 +4238,8 @@
/* Now we own the last reference to 'v', so we can resize it
* in-place.
*/
- int v_len = PyString_GET_SIZE(v);
- int w_len = PyString_GET_SIZE(w);
+ Py_ssize_t v_len = PyString_GET_SIZE(v);
+ Py_ssize_t w_len = PyString_GET_SIZE(w);
if (_PyString_Resize(&v, v_len + w_len) != 0) {
/* XXX if _PyString_Resize() fails, 'v' has been
* deallocated so it cannot be put back into 'variable'.