Fix compilation on OS X 10.9 (clang) and Arch Linux

I had the following error while trying to package this repository (`groovy-devel`) on Arch Linux:

```sh
[ 51%] Generating src/widgets/moc_planning_groups_widget.cxx
Generating src/widgets/moc_double_list_widget.cxx
usr/include/boost/type_traits/detail/has_binary_operator.hp:50: Parse error at "BOOST_JOIN"
CMakeFiles/moveit_setup_assistant.dir/build.make:71: recipe for target 'src/widgets/moc_start_screen_widget.cxx' failed
```

Note that I use Boost 1.55. This is a [known bug](https://bugreports.qt-project.org/browse/QTBUG-22829) with Qt4. The patch that was recently pushed to `hydro-devel` also solves this problem on `groovy-devel`.