Include every repo only once in the $*REPO chain
Include every repo only once in the $*REPO chain

CompUnitRepo caches repositories by path and will give you the same repo object
for the same path. Since repos are now a linked list, re-using an object from
the end of the list, will give you a rather short chain.

Having a path represented by only a single object is still a good idea. And
there should be no reason to have a path in multiple places of the repo chain,
so avoid the breakage by making sure we include every repo only once.

samcv/rakudo,samcv/rakudo,tony-o/rakudo,ungrim97/rakudo,nbrown/rakudo,softmoth/rakudo,LLFourn/rakudo,Gnouc/rakudo,Gnouc/rakudo,paultcochrane/rakudo,rakudo/rakudo,zostay/rakudo,LLFourn/rakudo,dankogai/rakudo,ungrim97/rakudo,ab5tract/rakudo,paultcochrane/rakudo,softmoth/rakudo,salortiz/rakudo,tbrowder/rakudo,dankogai/rakudo,sjn/rakudo,salortiz/rakudo,nbrown/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,usev6/rakudo,b2gills/rakudo,ab5tract/rakudo,b2gills/rakudo,rakudo/rakudo,rakudo/rakudo,sjn/rakudo,tony-o/rakudo,raydiak/rakudo,tony-o/rakudo,raydiak/rakudo,azawawi/rakudo,salortiz/rakudo,MasterDuke17/rakudo,Gnouc/rakudo,Gnouc/rakudo,tbrowder/rakudo,ungrim97/rakudo,jonathanstowe/rakudo,ugexe/rakudo,azawawi/rakudo,zostay/rakudo,samcv/rakudo,b2gills/rakudo,rakudo/rakudo,lucasbuchala/rakudo,dankogai/rakudo,tony-o/rakudo,MasterDuke17/rakudo,MasterDuke17/rakudo,zostay/rakudo,salortiz/rakudo,nbrown/rakudo,LLFourn/rakudo,nbrown/rakudo,softmoth/rakudo,samcv/rakudo,sjn/rakudo,tony-o/rakudo,tbrowder/rakudo,labster/rakudo,ugexe/rakudo,jonathanstowe/rakudo,sjn/rakudo,paultcochrane/rakudo,labster/rakudo,raydiak/rakudo,nbrown/rakudo,azawawi/rakudo,ungrim97/rakudo,salortiz/rakudo,labster/rakudo,dankogai/rakudo,ugexe/rakudo,awwaiid/rakudo,labster/rakudo,MasterDuke17/rakudo,awwaiid/rakudo,ungrim97/rakudo,zostay/rakudo,lucasbuchala/rakudo,tony-o/rakudo,usev6/rakudo,awwaiid/rakudo,usev6/rakudo,rakudo/rakudo,salortiz/rakudo,jonathanstowe/rakudo,Gnouc/rakudo,ugexe/rakudo,b2gills/rakudo,ab5tract/rakudo,LLFourn/rakudo,awwaiid/rakudo,ugexe/rakudo,dankogai/rakudo,sjn/rakudo,lucasbuchala/rakudo,usev6/rakudo,lucasbuchala/rakudo,paultcochrane/rakudo,azawawi/rakudo,ab5tract/rakudo,ab5tract/rakudo,softmoth/rakudo,raydiak/rakudo,nbrown/rakudo,labster/rakudo,LLFourn/rakudo,MasterDuke17/rakudo,azawawi/rakudo,samcv/rakudo,tbrowder/rakudo,Gnouc/rakudo,MasterDuke17/rakudo,rakudo/rakudo,tbrowder/rakudo,jonathanstowe/rakudo,b2gills/rakudo,paultcochrane/rakudo,labster/rakudo,usev6/rakudo,tbrowder/rakudo,softmoth/rakudo,awwaiid/rakudo