Downgrade unknown-warning-option errors to warnings becasue older clang versions might not recognize all options. 	Change on 2012/11/16 by kstanger@kstanger ------------- Created by MOE: http://code.google.com/p/moe-java MOE_MIGRATED_REVID=38859912
Downgrade unknown-warning-option errors to warnings becasue older clang versions might not recognize all options.
	Change on 2012/11/16 by kstanger@kstanger
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=38859912

ZouQingcang/MyProject,Sellegit/j2objc,gank0326/j2objc,ZouQingcang/MyProject,gank0326/j2objc,ZouQingcang/MyProject,larrytin/j2objc,Sellegit/j2objc,Sellegit/j2objc,hambroperks/j2objc,jiachenning/j2objc,Sellegit/j2objc,jiachenning/j2objc,hambroperks/j2objc,gank0326/j2objc,larrytin/j2objc,larrytin/j2objc,csripada/j2objc,rwl/j2objc,jiachenning/j2objc,hambroperks/j2objc,ZouQingcang/MyProject,hambroperks/j2objc,rwl/j2objc,Sellegit/j2objc,gank0326/j2objc,larrytin/j2objc,hambroperks/j2objc,rwl/j2objc,jiachenning/j2objc,csripada/j2objc,csripada/j2objc,larrytin/j2objc,ZouQingcang/MyProject,gank0326/j2objc,hambroperks/j2objc,hambroperks/j2objc,jiachenning/j2objc