Merge pull request #371 from compnerd/llp64

BlocksRuntime: match the ABI specification for LLP64
diff --git a/src/BlocksRuntime/Block_private.h b/src/BlocksRuntime/Block_private.h
index 57b270e..b2e1512 100644
--- a/src/BlocksRuntime/Block_private.h
+++ b/src/BlocksRuntime/Block_private.h
@@ -38,8 +38,8 @@
 
 #define BLOCK_DESCRIPTOR_1 1
 struct Block_descriptor_1 {
-    uintptr_t reserved;
-    uintptr_t size;
+    unsigned long int reserved;
+    unsigned long int size;
 };
 
 #define BLOCK_DESCRIPTOR_2 1