RExternalPackages.cmake - Fix indent and remove extra double quotes
RExternalPackages.cmake - Fix indent and remove extra double quotes

arborworkflows/Visomics,arborworkflows/Visomics,Visomics/Visomics,Visomics/Visomics,arborworkflows/Visomics,Visomics/Visomics,Visomics/Visomics,arborworkflows/Visomics,Visomics/Visomics,Visomics/Visomics,arborworkflows/Visomics,arborworkflows/Visomics