Fix warnings on 64-bit platforms about casts from pointers to ints.
Two of these were real bugs.
diff --git a/Objects/obmalloc.c b/Objects/obmalloc.c
index 95c0e87..753b2cc 100644
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -437,7 +437,7 @@
arenabase = bp;
nfreepools = ARENA_SIZE / POOL_SIZE;
assert(POOL_SIZE * nfreepools == ARENA_SIZE);
- excess = (uint)bp & POOL_SIZE_MASK;
+ excess = (uint) ((Py_uintptr_t)bp & POOL_SIZE_MASK);
if (excess != 0) {
--nfreepools;
arenabase += POOL_SIZE - excess;