use the symlinked virtual path instead of systems real path

[polarity]

when im trying to build an app with dependencies linked relative out of an symlinked directory, r.js uses the current absolute system path instead of the virtual path.

Folder Structure:

/
|-libraries
|    |-jquery
|    |-bootstrap
|    |-requirejs
|-web
|   |-www_app1
|   |-www_app2
|       |- webroot  -> /coding/app/myapp
|       |- lib -> /libraries/
|-coding
|    |-app
|       |-myapp
|            |-mycode.js
|            |-Gruntfile.js

building out of "/web/www_app2/webroot/" with a path set to an relative upper folder like "../lib/" wont work, because "grunt-requirejs" or "r.js" resolve the current dir as a absolute system path.

"../" in "/web/www_app2/webroot/" would go straight to "/coding/app/" instead of "/web/www_app2/"