sys-apps/portage: Bump to version 2.3.72

sys-apps/portage: Bump to version 2.3.72

 #463952 glsa-check: install in /usr/bin
 #646090 preserve-libs: get dep graph from EROOT
 #690484 detect internal collisions for /usr merge
 #690786 repoman: support metadata/layout.conf restrict-allowed
 #691776 unpack: Unconditionally die if an unpacker returns an error
 #691638 Show get/setfattr stderr
 #692024 econf: Unconditionally die on error in EAPIs 0 to 3
 #692262 QA Notice: EXPORT_FUNCTIONS is called before inherit in
         kernel-2.eclass
 #692412 emerge IndexError for ambiguous package atom with pypy

Bug: https://bugs.gentoo.org/691278
Bug: https://bugs.gentoo.org/463952
Bug: https://bugs.gentoo.org/646090
Bug: https://bugs.gentoo.org/690484
Bug: https://bugs.gentoo.org/690786
Bug: https://bugs.gentoo.org/691776
Bug: https://bugs.gentoo.org/691638
Bug: https://bugs.gentoo.org/692024
Bug: https://bugs.gentoo.org/692262
Bug: https://bugs.gentoo.org/692412
Package-Manager: Portage-2.3.71, Repoman-2.3.17
Signed-off-by: Zac Medico <zmedico@gentoo.org>