Linux Loader: passing right args to libraries' function

_From [qin.zhao@gmail.com](https://code.google.com/u/qin.zhao@gmail.com/) on May 31, 2011 15:58:22_

The regular loader always pass argc, argv, and env to libraries.
In our private loader, we pass dummy argc and argv, and the real __environ to our loaded libraries instead.

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=475_