Added test for uintptr_t, the C9X acceptable way to spell "type to
which I can cast void* to and back again without losing information".
In pyport.h, we typedef Py_uintptr_t to mean this thing, which if the
platform supports, will be uintptr_t (otherwise, other accomodations
are made).
diff --git a/config.h.in b/config.h.in
index c256690..debcbf8 100644
--- a/config.h.in
+++ b/config.h.in
@@ -124,6 +124,9 @@
 /* Define this if you have the type long long */
 #undef HAVE_LONG_LONG
 
+/* Define this if you have the type uintptr_t */
+#undef HAVE_UINTPTR_T
+
 /* Define if your compiler supports function prototypes */
 #undef HAVE_PROTOTYPES
 
@@ -254,6 +257,9 @@
 /* The number of bytes in a short.  */
 #undef SIZEOF_SHORT
 
+/* The number of bytes in a uintptr_t.  */
+#undef SIZEOF_UINTPTR_T
+
 /* The number of bytes in a void *.  */
 #undef SIZEOF_VOID_P