bundlerApp: take buildInputs (#45435)

It would be reasonable to have a Ruby program that depends on some other
program being in the PATH. In this case, the obvious thing to do would
be something like this:

    bundlerApp {
      # ...
      buildInputs = [ makeWrapper ];
      postBuild = ''
        wrapProgram "$out/bin/foo" \
          --prefix PATH : ${lib.makeBinPath [ dep ]}
      '';
    }

However, this doesn't work, because even though it just forwards most of
its arguments to `runCommand`, `bundlerApp` won't take a `buildInputs`
parameter. It doesn't even specify its own `buildInputs`, which means
that the `scripts` parameter to `bundlerApp` (which depends on
`makeWrapper`) is completely broken, and, as far as I can tell, has been
since its inception. I've added a `makeWrapper` build input if the
scripts parameter is present to fix this.

I've added a `buildInputs` option to `bundlerApp`. It's also passed
through to bundled-common because `postBuild` scripts are run there as
well. This actually means that in this example we'd end up going through
two layers of wrappers (one from `bundlerApp` and one from
bundled-common), but that has always been the case and isn't likely to
break anything. That oddity does suggest that it might be prudent to
not forward `postBuild` to bundled-common (or to at least use a
different option) though...

FWIW, as far as I can tell no package in nixpkgs uses either the
`scripts` or `postBuild` options to `bundlerApp`.

pkgs/development/ruby-modules/bundled-common/default.nix

@@ -19,6 +19,7 @@
 , meta ? {}
 , groups ? ["default"]
 , ignoreCollisions ? false
+, buildInputs ? []
 , ...
 }@args:
 
@@ -96,7 +97,7 @@ let
   envPaths = lib.attrValues gems ++ lib.optional (!hasBundler) bundler;
 
   basicEnv = buildEnv {
-    inherit  ignoreCollisions;
+    inherit buildInputs ignoreCollisions;
 
     name = name';