sys-apps/portage: Bump to version 2.3.80

sys-apps/portage: Bump to version 2.3.80

 #667432 Rename DCO_SIGNED_OFF_BY config variable to SIGNED_OFF_BY.
 #674562 eapply: Drop -s option for patch.
 #689226 emerge --buildpkgonly: respect buildtime hard blockers
 #699986 emerge: add --quickpkg-direct option

Bug: https://bugs.gentoo.org/701268
Bug: https://bugs.gentoo.org/667432
Bug: https://bugs.gentoo.org/674562
Bug: https://bugs.gentoo.org/689226
Bug: https://bugs.gentoo.org/699986
Package-Manager: Portage-2.3.80, Repoman-2.3.18
Signed-off-by: Zac Medico <zmedico@gentoo.org>