s3.TUP: Add use of s3 internal package installer which was extented for plugin use in 2586ebf. Some code beautifying, add crosstool-ng version output in build.log.
_sys_check: Add support for distro Arch
installers: Update with s3.TUP package exceptions, CentOS 8, Fedora 31
s3.TUP: Add use of s3 internal package installer which was extented for plugin use in 2586ebf. Some code beautifying, add crosstool-ng version output in build.log. _sys_check: Add support for distro Arch installers: Update with s3.TUP package exceptions, CentOS 8, Fedora 31