Update tutorial-ubuntu-16.04.md
Update tutorial-ubuntu-16.04.md

Add the spell 
```
 -Wl,--export-dynamic
```
SRI-CSL/whole-program-llvm,SRI-CSL/whole-program-llvm,travitch/whole-program-llvm,travitch/whole-program-llvm,SRI-CSL/whole-program-llvm,SRI-CSL/whole-program-llvm,travitch/whole-program-llvm,travitch/whole-program-llvm,SRI-CSL/whole-program-llvm