texlivePackages: omit texsource in Hydra builds

  outputs = lib.optional hasBinfiles "out" ++

    lib.optional hasRunfiles "tex" ++

    lib.optional hasDocfiles "texdoc" ++

    lib.optional hasSource "texsource" ++

    # omit building sources, since as far as we know, installing them is not common

    # the sources will still be available under drv.texsource

    # lib.optional hasSource "texsource" ++

    lib.optional hasTlpkg "tlpkg" ++

    lib.optional hasManpages "man" ++

    lib.optional hasInfo "info";