New issue by biopsin on void-packages repository

https://github.com/void-linux/void-packages/issues/18363

Description:
Heya, maybe I'm doin it wrong lately so sorry for the fuzz..
know I saw Duncan posting a remark somewhere about this sometime ago but I can't find it and I can't seem to find the actual merge that change this behavour.

### Expected behavior
Leave masterdir alone until a successfull pkg unless -C

### Actual behavior
cleans masterdir between manual stages "extract -> build -> install -> ..."
xbps-src -f build will clean masterdir and all manual edits are therefore lost inbetween.

makes it hard to test and resolve different issues in different stages when masterdir gets clean every time :D