Move LD_FLAGS before -o in linking step.
Move LD_FLAGS before -o in linking step.

smharper/openmc,lilulu/openmc,smharper/openmc,johnnyliu27/openmc,bhermanmit/openmc,shikhar413/openmc,wbinventor/openmc,mit-crpg/openmc,kellyrowland/openmc,amandalund/openmc,liangjg/openmc,mjlong/openmc,samuelshaner/openmc,lilulu/openmc,mit-crpg/openmc,johnnyliu27/openmc,samuelshaner/openmc,liangjg/openmc,keadyk/openmc_mg_prepush,paulromano/openmc,shenqicang/openmc,bhermanmit/openmc,mit-crpg/openmc,walshjon/openmc,liangjg/openmc,nhorelik/openmc,smharper/openmc,sxds/opemmc,shenqicang/openmc,wbinventor/openmc,mjlong/openmc,shikhar413/openmc,shikhar413/openmc,keadyk/openmc_mg_prepush,johnnyliu27/openmc,bhermanmit/cdash,liangjg/openmc,wbinventor/openmc,wbinventor/openmc,sxds/opemmc,paulromano/openmc,amandalund/openmc,shikhar413/openmc,mit-crpg/openmc,nhorelik/openmc,walshjon/openmc,kellyrowland/openmc,paulromano/openmc,smharper/openmc,walshjon/openmc,amandalund/openmc,johnnyliu27/openmc,lilulu/openmc,walshjon/openmc,paulromano/openmc,samuelshaner/openmc,amandalund/openmc,keadyk/openmc_mg_prepush,samuelshaner/openmc