Ticket #3137 Only enable -flto on gcc >= 4.7.0 otherwise punt
Ticket #3137 Only enable -flto on gcc >= 4.7.0 otherwise punt

neurodebian/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,zhangzhehust/htcondor,htcondor/htcondor,djw8605/htcondor,htcondor/htcondor,djw8605/htcondor,htcondor/htcondor,djw8605/htcondor,htcondor/htcondor,neurodebian/htcondor,zhangzhehust/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,htcondor/htcondor,zhangzhehust/htcondor,djw8605/condor,zhangzhehust/htcondor,neurodebian/htcondor,djw8605/htcondor,htcondor/htcondor,htcondor/htcondor,djw8605/condor,djw8605/condor,zhangzhehust/htcondor,djw8605/condor,djw8605/htcondor,djw8605/htcondor,djw8605/condor,neurodebian/htcondor,djw8605/condor,djw8605/condor,zhangzhehust/htcondor,djw8605/condor,neurodebian/htcondor,djw8605/htcondor,zhangzhehust/htcondor,djw8605/htcondor,neurodebian/htcondor,htcondor/htcondor,neurodebian/htcondor,djw8605/htcondor