Use PORTAGE_PROPERTIES and PORTAGE_RESTRICT internally

Use PORTAGE_PROPERTIES and PORTAGE_RESTRICT directly for internal
purposes rather than relying on PROPERTIES and RESTRICT having
the flattened values.

Reviewed-by: Zac Medico <zmedico@gentoo.org>
Closes: https://github.com/gentoo/portage/pull/734
Signed-off-by: Michał Górny <mgorny@gentoo.org>
8 files changed