There's a closed pull request on the void-packages repository

[On hold] p7zip: update to 17.04
https://github.com/void-linux/void-packages/pull/27953

Description:
Switch distfiles to fork @ https://github.com/jinfeihan57/p7zip
Become maintainer
Change build option to "all2" since "all3" includes "7zr" which is a light version of included "7za"

remove patches
add changelog

tested install : x86_64/-musl