New comment by reback00 on void-packages repository

https://github.com/void-linux/void-packages/pull/15627#issuecomment-549018252

Comment:
@jnbr, Well, Textadept needs these when building. If you [build from source](https://notabug.org/reback00/ta-config/src/master/patches/README.md), you will see that they are downloaded from predefined sources when building. And on the [old PR](https://github.com/void-linux/void-packages/pull/15278), @Chocimier suggested these deps should be cached:
> Ideally, deps should be added to distfiles for caching...

So when I added the deps to distfiles for caching, xbps-src downloaded them just fine, but the zip/tar files were extracted automatically to build dir... which makes the build process not find the deps zip/tar files and it downloads them again. So I had to add the deps files to `skip_extraction` so that they are not extracted. That's why the mention of them the second time. @Chocimier also helped me find a `post_fetch` function that copies the deps zip/tar files to builddir src directory.

Please feel free to suggest anything better.