cross-emerge: Default to using no prefixbug_642604

On non-prefixed systems, cross-emerge installs to /usr/${CHOST} by
default. On prefixed systems, this default effectively becomes
${BROOT}/usr/${CHOST}/${BROOT}, which is unexpected and makes little
sense. The first BROOT originates from the ROOT setting in the cross
make.conf. The second BROOT is the prefix that Portage is configured
to use by default.

We therefore need to avoid the second BROOT by overriding Portage with
a blank EPREFIX value. Note that a bug in Portage itself means that
this is ineffective on versions before 2.3.69 but it's no worse than
it was before either.

For users who do want to set their own EPREFIX, the PORTAGE_CONFIGROOT
default has been updated to ${SYSROOT}${EPREFIX} as the prefixed
location is required for this variable. This is despite man emerge
suggesting otherwise!

Closes: https://bugs.gentoo.org/642604
Signed-off-by: James Le Cuirot <chewi@gentoo.org>

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