Disable attribute use with g++ < 3.4, these do not understand them.
Disable attribute use with g++ < 3.4, these do not understand them.

git-svn-id: 14be032f8f42541b1a281b51ae8ea69814daf20e@4409 4b44e086-7f34-40ce-a3bd-00e031736276

BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc,BlueBrain/hwloc