fix(shell/lean.cpp): fix not to overwrite optind by getopt_long
fix(shell/lean.cpp): fix not to overwrite optind by getopt_long

soonhokong/lean,UlrikBuchholtz/lean,eigengrau/lean,rlewis1988/lean,javra/lean,sp3ctum/lean,soonhokong/travis_test,dselsam/lean,leanprover-community/lean,avigad/lean,Kha/lean,rlewis1988/lean,dselsam/lean,levnach/lean,UlrikBuchholtz/lean,eigengrau/lean,soonhokong/lean-windows,sp3ctum/lean,soonhokong/lean-osx,htzh/lean,leanprover-community/lean,htzh/lean,avigad/lean,eigengrau/lean,c-cube/lean,c-cube/lean,eigengrau/lean,digama0/lean,avigad/lean,fpvandoorn/lean2,leanprover/lean,javra/lean,leanprover/lean,digama0/lean,leodemoura/lean,johoelzl/lean,leodemoura/lean,c-cube/lean,javra/lean,digama0/lean,javra/lean,fpvandoorn/lean2,soonhokong/lean-osx,rlewis1988/lean,fgdorais/lean,leanprover/lean,UlrikBuchholtz/lean,leanprover/lean,eigengrau/lean,sp3ctum/lean,soonhokong/lean,fpvandoorn/lean2,codyroux/lean0.1,levnach/lean,soonhokong/lean-osx,codyroux/lean0.1,fgdorais/lean,soonhokong/lean-windows,digama0/lean,sp3ctum/lean,dselsam/lean,soonhokong/lean-osx,johoelzl/lean,javra/lean,leanprover-community/lean,soonhokong/travis_test,soonhokong/lean-windows,leanprover-community/lean,c-cube/lean,soonhokong/lean-osx,rlewis1988/lean,leodemoura/lean,sp3ctum/lean,Kha/lean,soonhokong/lean,levnach/lean,leanprover/lean,c-cube/lean,dselsam/lean,fgdorais/lean,htzh/lean,fpvandoorn/lean,johoelzl/lean,soonhokong/lean,leodemoura/lean,dselsam/lean,Kha/lean,fpvandoorn/lean2,fgdorais/lean,leodemoura/lean,soonhokong/lean,digama0/lean,rlewis1988/lean,UlrikBuchholtz/lean,fgdorais/lean,leanprover-community/lean,levnach/lean,Kha/lean,codyroux/lean0.1,fgdorais/lean,johoelzl/lean,johoelzl/lean,soonhokong/lean-windows,fpvandoorn/lean,avigad/lean,avigad/lean,dselsam/lean,leodemoura/lean,digama0/lean,Kha/lean,soonhokong/travis_test,fpvandoorn/lean,fpvandoorn/lean2,soonhokong/lean-windows,fpvandoorn/lean,avigad/lean,rlewis1988/lean,levnach/lean,htzh/lean,leanprover-community/lean,Kha/lean,johoelzl/lean,UlrikBuchholtz/lean,fpvandoorn/lean,soonhokong/travis_test,htzh/lean,fpvandoorn/lean,leanprover/lean,codyroux/lean0.1