MFH: r454204
security/nss: update to 3.34
Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.34_release_notes
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_34_RTM
ABI: https://abi-laboratory.pro/tracker/timeline/nss/
Approved by: ports-secteam (swills)