profiles/uclibc/packages: prefix app-misc/pax-utils with '*'

profiles/uclibc/packages: prefix app-misc/pax-utils with '*'

It's the only entry of all profiles without '*'.

  portage/gentoo/profiles $ grep '^[^*-\#]' $(find -name packages)
  ./uclibc/packages:app-misc/pax-utils

It's an ancient entry from 2005:
    https://github.com/gentoo/gentoo-gitmig-20150809-draft/commit/7bed3578ef4990787cd6881c8fc8d5085b617494

Not sure if entry should be removed completely or explicitly
pulled in @system.

The change pulls it in.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>