Fix #77 build on FreeBSD 10
Fix #77 build on FreeBSD 10

google/benchmark,Photonomie/benchmark,everbase/benchmark,subailong/benchmark,fuchsia-mirror/third_party-benchmark,codygray/benchmark,bowlofstew/benchmark,mockingbirdnest/benchmark,efcs/benchmark,fuchsia-mirror/third_party-benchmark,eliben/benchmark,eliben/benchmark,eliben/benchmark,fuchsia-mirror/third_party-benchmark,subailong/benchmark,chemhack/benchmark,LepelTsmok/benchmark,quantumsteve/benchmark,efcs/benchmark,xlqian/benchmark,chemhack/benchmark,gezidan/benchmark,LepelTsmok/benchmark,nickhutchinson/benchmark,bowlofstew/benchmark,google/benchmark,mockingbirdnest/benchmark,xlqian/benchmark,ntx-/benchmark,codygray/benchmark,everbase/benchmark,eliben/benchmark,nickhutchinson/benchmark,chemhack/benchmark,efcs/benchmark,Photonomie/benchmark,gezidan/benchmark,nickhutchinson/benchmark-cxx03,mockingbirdnest/benchmark,mockingbirdnest/benchmark,Photonomie/benchmark,codygray/benchmark,chandlerc/benchmark,nickhutchinson/benchmark-cxx03,chandlerc/benchmark,efcs/benchmark,subailong/benchmark,quantumsteve/benchmark,disconnect3d/benchmark,gezidan/benchmark,fuchsia-mirror/third_party-benchmark,disconnect3d/benchmark,chandlerc/benchmark,Photonomie/benchmark,ntx-/benchmark,disconnect3d/benchmark,ntx-/benchmark,bowlofstew/benchmark,everbase/benchmark,bowlofstew/benchmark,xlqian/benchmark,quantumsteve/benchmark,nickhutchinson/benchmark,subailong/benchmark,nickhutchinson/benchmark-cxx03,chemhack/benchmark,chandlerc/benchmark,codygray/benchmark,LepelTsmok/benchmark,ntx-/benchmark,gezidan/benchmark,nickhutchinson/benchmark,everbase/benchmark,nickhutchinson/benchmark-cxx03,google/benchmark,xlqian/benchmark,disconnect3d/benchmark,LepelTsmok/benchmark,quantumsteve/benchmark