Request to backport: 6962540: langtools Makefile sets DEV_NULL incorrectly

[Jonathan Gibbons]

Joe,

I'd like to backport the following new changeset from tl/langtools:

changeset:   582:0ba1f80b73a5
tag:         tip
user:        jjg
date:        Fri Jun 18 16:45:13 2010 -0700
summary:     6962540: langtools Makefile sets DEV_NULL incorrectly

-- Jon