bintree: don't call trust helper unless bindb is writable #1224
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Followup to 6ae4573. My qualm there wrt writable was whether or not doing something which mutated state (and therefore possibly the package list) would be confusing but that doesn't make much sense for a few reasons.
Anyway, change the test to be not just for no-pretend, but also whether the
bindb is writable too, as pretend is already a proxy for whether we may
not have privileges (I can imagine someone possibly having bindb privileges
but not /etc/portage/gnupg, so better to just head this off entirely).
Bug: https://bugs.gentoo.org/915842
Bug: https://bugs.gentoo.org/920180