Arch Linux

Description:

We do some sed magic in the PKGBUILD, that seems to cause issues.
Ammonite can not even start. It works fine when built from source.

Broken package versions: 2.3.7 and 2.3.8.
It seems to work fine in 2.3.6 and before.

Upstream bug-reports, all from Arch users:
- https://github.com/lihaoyi/Ammonite/issues/1129
- https://github.com/lihaoyi/os-lib/issues/49

Steps to reproduce:
Run `amm` without any flags:

```
$ amm
Loading...
Exception in thread "main" os.PathError$InvalidSegment: [] is not a valid path segment. OS-Lib does not allow empty path segments If you are dealing with path-strings coming from external sources, use the Path(...) or RelPath(...) constructor calls to convert them.
at os.BasePath$.fail$1(Path.scala:120)
at os.BasePath$.checkSegment(Path.scala:137)
at os.PathChunk$StringPathChunk.<init>(Path.scala:21)
at os.PathChunk$.StringPathChunk(Path.scala:20)
at ammonite.runtime.Storage$Folder.<init>(Storage.scala:189)
at ammonite.MainRunner.initMain(Main.scala:452)
at ammonite.MainRunner.watchLoop(Main.scala:396)
at ammonite.MainRunner.runRepl(Main.scala:415)
at ammonite.Main$.main0(Main.scala:321)
at ammonite.Main$.main(Main.scala:270)
at ammonite.Main.main(Main.scala)
```