_emerge: Add the missed emerge-fetch.log in previous commit
Wrap fakeroot around MISC_SH_BINARY calls

When feature fakeroot is active all pre/post actions need
to be called with the fakeroot wrapper.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
dep_zapdeps: fix bug #522652

For cases such as || ( X <A-2 ), where X is unsatisfiable and A-1 is
installed, fix dep_zapdeps to make the correct choice.
Support unprivileged mode for bug #433453.

This takes the existing unprivileged prefix support and enables it to
work when EPREFIX is empty. This "unprivileged" is automatically
enabled if the current user is not root, but has write access to the
EROOT directory (not due to the 0002 bit). For use in conditional logic
(for example, see fowners diff), "unprivileged" is automatically added
to the FEATURES variable.

X-Gentoo-Bug: 433453
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=433453