Use alternate method to get rid of PKGEXT, groups, replaces

[xiota]

Use alternate method to get rid of PKGEXT, groups, replaces. sed fails to catch many cases. Use unset instead.

Add missing newline at end of PKGBUILD. Packages that are missing a newline at the end of the file abort without doing anything.

nuclear-player-bin.log

``` Building package "nuclear-player-bin" :: Synchronizing package databases... core downloading... extra downloading... community downloading... multilib downloading... chaotic-aur downloading... :: Starting full system upgrade... there is nothing to do umount: /home/xiota/nuclear-player-bin/machine/root/home/main-builder/pkgwork unmounted umount: /home/xiota/nuclear-player-bin/machine/root/home/main-builder/.ccache unmounted umount: /home/xiota/nuclear-player-bin/machine/root/home/main-builder/pkgsrc unmounted umount: /home/xiota/nuclear-player-bin/machine/root/var/cache/pacman/pkg unmounted umount: /home/xiota/nuclear-player-bin/machine/root/var/pkgdest unmounted umount: /home/xiota/nuclear-player-bin/machine/root (overlay) unmounted real 0m1.111s user 0m0.205s sys 0m0.355s ```

Closes #89