Link Time Optimization doesn't needs -static

Justin reports that it breaks the compilation on Fedore 15 and as Tom says:

-static is only needed to work around the gcc on ubuntu 11.10 beta bug.
If -static introduces issues on its own then it is better to remove it.
It will not be needed in most environments.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>