Make sure MEM_CHECK is not defined when it's not supposed to be
Make sure MEM_CHECK is not defined when it's not supposed to be

samuelshaner/openmc,liangjg/openmc,paulromano/openmc,bhermanmit/openmc,smharper/openmc,johnnyliu27/openmc,walshjon/openmc,amandalund/openmc,johnnyliu27/openmc,mit-crpg/openmc,amandalund/openmc,liangjg/openmc,mit-crpg/openmc,wbinventor/openmc,shikhar413/openmc,mit-crpg/openmc,walshjon/openmc,shikhar413/openmc,johnnyliu27/openmc,shikhar413/openmc,liangjg/openmc,johnnyliu27/openmc,mit-crpg/openmc,walshjon/openmc,liangjg/openmc,bhermanmit/openmc,samuelshaner/openmc,samuelshaner/openmc,wbinventor/openmc,walshjon/openmc,smharper/openmc,paulromano/openmc,smharper/openmc,amandalund/openmc,amandalund/openmc,wbinventor/openmc,smharper/openmc,wbinventor/openmc,samuelshaner/openmc,paulromano/openmc,paulromano/openmc,shikhar413/openmc