toast - problem recursing
Probably this is not a bug and this is just me misusing nimterop.

I am trying to wrap [MLT Framework](https://github.com/mltframework/mlt). The include files are under `src/framework/`, where the file [mlt.h](https://github.com/mltframework/mlt/blob/master/src/framework/mlt.h) is a reference to the other headers. But when I run:
```
$ toast -pnrks -f:ast2 -l libmlt.so -I./ mlt.h
# Generated at 2020-04-16T18:18:17+02:00
# Command line:
#   /home/jose/.nimble/pkgs/nimterop-#head/nimterop/toast -pnrks -f:ast2 -l libmlt.so -I./ mlt.h

{.hint[ConvFromXtoItselfNotNeeded]: off.}

import nimterop/types


{.pragma: impmlt, importc.}
{.pragma: impmltC, impmlt, cdecl, dynlib: libmlt.so.}
```
Is this a bug or am I missing something in the command line?

Regards
