gitweb: set pname and version, modernize, update (#489530)

  gitwebThemeSrc = fetchFromGitHub {

    owner = "kogakure";

    repo = "gitweb-theme";

    rev = "049b88e664a359f8ec25dc6f531b7e2aa60dd1a2";

    rev = "d4cc1792f10dac16dbeee06d7e0902715e4fa51a";

    postFetch = ''

      mkdir -p "$TMPDIR/gitwebTheme"

      mv "$out"/* "$TMPDIR/gitwebTheme/"

      mkdir "$out/static"

      mv "$TMPDIR/gitwebTheme"/* "$out/static/"

    '';

    sha256 = "17hypq6jvhy6zhh26lp3nyi52npfd5wy5752k6sq0shk4na2acqi";

    hash = "sha256-+e8ZP8hVGWQsXgyWUd/rF9+GRHNHJLFpOr5nsNIieyo";

  };

in

buildEnv {

  name = "gitweb-${lib.getVersion git}";

  inherit (git) version;

  pname = "gitweb";

  ignoreCollisions = true;

  paths = lib.optional gitwebTheme gitwebThemeSrc ++ [ "${git}/share/gitweb" ];