Some changes required for the new compiler.

- Import bleeding may be fixed, as I had to import a bunch of things I
  should have had to earlier.
- NOW they make duplicate variable definitions bad (but without block
  scoping... yay).
- Another hoopjump.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4233 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/io/ObjectInputStream.as

@@ -1,6 +1,7 @@
 package com.threerings.io {
 
 import flash.errors.IOError;
+import flash.errors.MemoryError;
 
 import flash.utils.ByteArray;
 import flash.utils.IDataInput;