New comment by Duncaen on void-packages repository

https://github.com/void-linux/void-packages/pull/15646#issuecomment-544287908

Comment:
This will leave files that can't be cleaned correctly in the build directory.
You can use `create_wrksrc=yes` to let xbps-src create the wrksrc directory and fetch files into it, which would clean up everything correctly and would not require `post_fetch`.