In other words, in `proj/tests` I have `nim.cfg`:
--listCmd
--path:"../src"
--passC:"-I../src/dazz_db"
I put `*.[c|h|nim]` in `proj/tests`. I do not want to force users to specify `-passC`. (The `--path` will come automatically from **nimble** eventually, I think.) How can I specify the `header` for `importc` in my Nim library modules so that the headers are picked up from the same directory as my Nim code?
