Makefile: fix manpage installation in packages
Makefile: fix manpage installation in packages

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