New review comment by meator on void-packages repository

https://github.com/void-linux/void-packages/pull/39583#discussion_r1060577846

Comment:
I don't think `sed` would even be necessary when `make_use_env` wouldn't be set. Xbps will override it whether the lines are there or not (when `make_use_env` is not set). But both of these approaches (just unsetting `make_use_env` or unsetting `make_use_env` and then doing `sed -e "/^CFLAGS/d; /^CXXFLAGS/d" -i "${build_wrksrc}/Makefile"`) have a flaw: they remove the `-fPIC` flag from `CFLAGS`. This flag affects compilation in a major way and shouldn't be removed without reason. `-fPIC` could be added to `make_build_args`. What do You think?