Improve warnings for escript.install, closes #4735
Improve warnings for escript.install, closes #4735

pedrosnk/elixir,lexmag/elixir,ggcampinho/elixir,kelvinst/elixir,kimshrier/elixir,kelvinst/elixir,kimshrier/elixir,elixir-lang/elixir,beedub/elixir,antipax/elixir,antipax/elixir,gfvcastro/elixir,ggcampinho/elixir,gfvcastro/elixir,lexmag/elixir,beedub/elixir,joshprice/elixir,pedrosnk/elixir,michalmuskala/elixir