--noNimblePath breaks nimfmt
```
$ nimble install --verbose https://github.com/ncihnegn/nimfmt 
     Info:  Nimble data file "~/.nimble/nimbledata2.json" has been loaded.
Downloading https://github.com/ncihnegn/nimfmt using git
   Warning: The package has no tagged releases, downloading HEAD instead.
  Verifying dependencies for nimfmt@0.2.0
 Installing nimfmt@0.2.0
   Building nimfmt/nimfmt using c backend
  Executing /usr/local/nim/2.0.0/bin/nim c --colors:on --noNimblePath -d:release -d:NimblePkgVersion=0.2.0 -o:/var/folders/x8/8s64cxbx0yj16d3shdxmm5gr0000gn/T/nimble_18845/githubcom_ncihnegnnimfmt/nimfmt /var/folders/x8/8s64cxbx0yj16d3shdxmm5gr0000gn/T/nimble_18845/githubcom_ncihnegnnimfmt/nimfmt.nim
/private/var/folders/x8/8s64cxbx0yj16d3shdxmm5gr0000gn/T/nimble_18845/githubcom_ncihnegnnimfmt/nimfmt.nim(18, 14) Error: cannot open file: compiler/ast
nimble.nim(229)          buildFromDir
```

It will build without `--noNimblePath`.