go-git-lfs: fix build

was failing with

output ‘/nix/store/…-go1.4-git-lfs-v1.0.0-bin’ is not allowed to refer
to path ‘/nix/store/…-go-1.4.3’

@nckx

pkgs/top-level/go-packages.nix

@@ -776,11 +776,6 @@ let
         go generate ./commands
       popd
     '';
-
-    postInstall = ''
-      mkdir -p $bin/share
-      mv $bin/bin/{man,script} $bin/share
-    '';
   };
 
   glide = buildFromGitHub {