add ifndef's to Variant.h for incorporation in other projects
add ifndef's to Variant.h for incorporation in other projects

glennhickey/vcflib,travc/vcflib,wzugang/vcflib,tomdcsmith/vcflib,harshinamdar/vcflib,hyphaltip/vcflib,andersje/vcflib,tomdcsmith/vcflib,ashishjain1988/vcflib,wzugang/vcflib,andersje/vcflib,alimanfoo/vcflib,jewmanchue/vcflib,vcflib/vcflib,zeeev/vcflib,glennhickey/vcflib,travc/vcflib,andersje/vcflib,alimanfoo/vcflib,jewmanchue/vcflib,glennhickey/vcflib,zeeev/vcflib,ekg/vcflib,jewmanchue/vcflib,hyphaltip/vcflib,zeeev/vcflib,zeeev/vcflib,glennhickey/vcflib,hyphaltip/vcflib,zeeev/vcflib,vcflib/vcflib,hyphaltip/vcflib,zhmz90/vcflib,jewmanchue/vcflib,andersje/vcflib,vcflib/vcflib,jewmanchue/vcflib,ashishjain1988/vcflib,travc/vcflib,alimanfoo/vcflib,vcflib/vcflib,wzugang/vcflib,wzugang/vcflib,glennhickey/vcflib,harshinamdar/vcflib,alimanfoo/vcflib,vcflib/vcflib,jewmanchue/vcflib,ekg/vcflib,ekg/vcflib,zhmz90/vcflib,zhmz90/vcflib,ashishjain1988/vcflib,vcflib/vcflib,ashishjain1988/vcflib,zhmz90/vcflib,andersje/vcflib,alimanfoo/vcflib,wzugang/vcflib,andersje/vcflib,hyphaltip/vcflib,ashishjain1988/vcflib,ekg/vcflib,zeeev/vcflib,harshinamdar/vcflib,harshinamdar/vcflib,wzugang/vcflib,vcflib/vcflib,zhmz90/vcflib,ashishjain1988/vcflib,zhmz90/vcflib,vcflib/vcflib,alimanfoo/vcflib,harshinamdar/vcflib,ekg/vcflib,glennhickey/vcflib,tomdcsmith/vcflib,hyphaltip/vcflib,harshinamdar/vcflib