New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/49361#discussion_r1530276644

Comment:
1. We don't permit checking out source code. Use `distfiles` to fetch a tagged tarball for the package version.
2. You should be using the `gnu-makefile` build style, which will define these functions for you. Control its behavior with `make_build_args`, `make_build_target`, `make_install_args`, `make_install_target`, etc.