security/nss: update to 3.64

Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.64_release_notes
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_64_RTM
(cherry picked from commit 7e8c7e0b65421657a900eacb88af4f1532736dfc)