Grunt build error, case sensitive name CodeMirror.js

Building from a fresh checkout (with recursive submodules) using `grunt build`, I get the following error on the `requirejs:dist` task:

```
Running "requirejs:dist" (requirejs) task

Tracing dependencies for: main
Error: ENOENT, no such file or directory '/home/miki/vcs/git/adobe/brackets/src/thirdparty/CodeMirror2/lib/CodeMirror.js'
In module tree:
    main
      brackets
        search/FindInFiles
          search/FindReplace

{ [Error: Error: ENOENT, no such file or directory '/home/miki/vcs/git/adobe/brackets/src/thirdparty/CodeMirror2/lib/CodeMirror.js'
In module tree:
    main
      brackets
        search/FindInFiles
          search/FindReplace

    at Object.fs.openSync (fs.js:427:18)
]
  originalError: 
   { [Error: ENOENT, no such file or directory '/home/miki/vcs/git/adobe/brackets/src/thirdparty/CodeMirror2/lib/CodeMirror.js']
     errno: 34,
     code: 'ENOENT',
     path: '/home/miki/vcs/git/adobe/brackets/src/thirdparty/CodeMirror2/lib/CodeMirror.js',
     syscall: 'open',
     fileName: '/home/miki/vcs/git/adobe/brackets/src/thirdparty/CodeMirror2/lib/CodeMirror.js',
     moduleTree: [ 'search/FindReplace', 'search/FindInFiles', 'brackets', 'main' ] } }
```

```
$ ls -l src/thirdparty/CodeMirror2/lib/
total 296
-rw-r--r-- 1 miki users   6309 Mar 19 20:33 codemirror.css
-rw-r--r-- 1 miki users 293877 Mar 19 20:33 codemirror.js
````

or, in other words: on *nix, files are case-[sensitive, you clod!](http://en.wikipedia.org/wiki/Slashdot) ;-)