fix compilation errors on freebsd 7.x
fix compilation errors on freebsd 7.x

mindw/psutil,Q-Leap-Networks/psutil,jamesblunt/psutil,mindw/psutil,jorik041/psutil,packages/psutil,msarahan/psutil,tomprince/psutil,mrjefftang/psutil,tomprince/psutil,mindw/psutil,0-wiz-0/psutil,tomprince/psutil,landryb/psutil,jorik041/psutil,cloudbase/psutil,tomprince/psutil,landryb/psutil,msarahan/psutil,0-wiz-0/psutil,mrjefftang/psutil,jorik041/psutil,mrjefftang/psutil,giampaolo/psutil,cloudbase/psutil,giampaolo/psutil,landryb/psutil,cloudbase/psutil,tomprince/psutil,mindw/psutil,qbit/psutil,qbit/psutil,msarahan/psutil,mindw/psutil,jamesblunt/psutil,qbit/psutil,Q-Leap-Networks/psutil,landryb/psutil,packages/psutil,jamesblunt/psutil,landryb/psutil,packages/psutil