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feature.h: Mask hints in CURRENT_FEATURE_BUNDLE
Otherwise CURRENT_FEATURE_BUNDLE will end up including any hints added
later that happen to use higher bits.
This was causing autobox to turn off all features, causing failures
for Dist::Zilla::PluginBundle::AVAR.
I’m not adding tests for this, as such tests would need constant
tweaking in future perl developement. What autobox is doing is
naughty and unsupported anyway.