[sys-apps/entropy*] version bump to 183
[sys-apps/shadow] add here, waiting for(ever?) Gentoo bug 461642

I just dropped the weird:
  use pam && pam_epam_expand "${D}"/etc/pam.d/login

Since the docstring of pam_epam_expand says:
"Steer clear, deprecated, don't use, bad experiment"

and:
"Think about it before uncommenting this one, for now run it by hand"
Revert "[sys-apps/shadow] add here, waiting for(ever?) Gentoo bug 461642"

This reverts commit 330f064d1bad592ed6bed10dc8682c37e1bb5bf4.
Already fixed upstream.