New issue by Animeshz on void-packages repository

https://github.com/void-linux/void-packages/issues/41008

Description:
I don't know if this is a valid issue, but compiling big projects like kernel/chromium etc. takes a while, and without cache preservation they take forever to build different versions.

If there could be a incremental compilation support in xbps-src as it already creates a stateful `masterdir`, it could really boost few aspects, such as testing for issues in different versions, and [producing patches](https://www.reddit.com/r/voidlinux/comments/z0mfbh/xbpssrc_creating_patches_for_a_new_package) for them.

Let me know your thoughts!