depends subfolder doesn't compile subprojects correctly

[andrevidela]

Steps to Reproduce

setup a project like this:

├── depends
│   └── dep-0
│       ├── dep.ipkg
│       └── src
│           └── Dep.idr
├── main.ipkg
└── src
    └── Main.idr

With main.ipkg containing:

package main
depends = dep 

sourcedir = "src"

and dep.ipkg containing:

package dep
version = 0

modules = Dep

sourcedir = "src"

Main.idr:

module Main
import Dep

main : IO ()
main = putStrLn str

Dep.idr:

module Dep
str : String
str = "hello"

Expected Behavior

Compiling main with idris2 --build main.ipkg should work.

Observed Behavior

Uncaught error: "Depends/depends/dep-0/dep.ipkg":4:11--6:1:Dep not found

If the dependency is instead installed globally with --install and the depends folder removed, the project works just fine