Correctly parse the flags in cabal solver output
Correctly parse the flags in cabal solver output

Also, always use the user specified flags as constraint.

anton-dessiatov/stack,Heather/stack,martin-kolinek/stack,achernyak/stack,narrative/stack,MichielDerhaeg/stack,AndrewRademacher/stack,deech/stack,Fuuzetsu/stack,achernyak/stack,martin-kolinek/stack,phadej/stack,AndreasPK/stack,anton-dessiatov/stack,AndrewRademacher/stack,Fuuzetsu/stack,harendra-kumar/stack,juhp/stack,mrkkrp/stack,luigy/stack,phadej/stack,sjakobi/stack,mrkkrp/stack,juhp/stack,luigy/stack,Heather/stack,Blaisorblade/stack,MichielDerhaeg/stack,harendra-kumar/stack,deech/stack,AndreasPK/stack,Blaisorblade/stack,narrative/stack,sjakobi/stack