MFH: r486308

security/nss: update to 3.40.1

Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.40.1_release_notes
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_40_1_RTM
ABI: https://abi-laboratory.pro/tracker/timeline/nss/
Security: CVE-2018-12404
Approved by: ports-secteam (required by Firefox 64)