[Buildroot] Adding extra c files

[Ratin Rahman]

> I am trying to add a custom C file that I would be calling from another file in the package in out/build/software-component/
> for debugging. What would be the best way to do that? I dont want to make too much changes.
> If there were a makefile, adding the  file in that folder and rebuilding would've made it work in most cases but the scon and the python build environment is a bit too complicated  for me.
> Thanks
> Ratin