Remove unused and wrong make variable
Remove unused and wrong make variable

NQP_HOME might be located in a different prefix from rakudo. Thus relying
on LIBDIR in it's construction is wrong.

nbrown/rakudo,rakudo/rakudo,labster/rakudo,rakudo/rakudo,tbrowder/rakudo,softmoth/rakudo,tony-o/rakudo,softmoth/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,softmoth/rakudo,tony-o/rakudo,tbrowder/rakudo,nbrown/rakudo,rakudo/rakudo,nbrown/rakudo,MasterDuke17/rakudo,salortiz/rakudo,labster/rakudo,softmoth/rakudo,salortiz/rakudo,labster/rakudo,tbrowder/rakudo,nbrown/rakudo,softmoth/rakudo,MasterDuke17/rakudo,tony-o/rakudo,labster/rakudo,nbrown/rakudo,MasterDuke17/rakudo,tony-o/rakudo,rakudo/rakudo,labster/rakudo,MasterDuke17/rakudo,tony-o/rakudo,nbrown/rakudo,tbrowder/rakudo,labster/rakudo,salortiz/rakudo,MasterDuke17/rakudo,salortiz/rakudo,tbrowder/rakudo,tbrowder/rakudo,salortiz/rakudo,tony-o/rakudo,salortiz/rakudo