[birt-dev]CheckIn: Fix compile error in RAStreamBufferMgr

["Wei Yan" <wyan@xxxxxxxxxxx>]

Title: [birt-dev]CheckIn: Fix compile error in RAStreamBufferMgr

- Summary:

- Bugzilla Bug (s) Resolved:

- Description:
        JDK 1.5 allows the primary type as the key of the hashMap while JDK1.4 only allow object as the key.

- Tests Description  :
        Manually build.

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  
 
- Notes to Documentation:  

- Files Edited:
cvs ci -m "fix a bug caused by the uncompatiability of JDK1.4 and JDK1.5" -l "/org.eclipse.birt.core/src/org/eclipse/birt/core/archive/RAStreamBufferMgr.java"

- Files Added:

- Files Deleted

-Wei Yan