MFH: r434157 r434498
security/nss: update to 3.29.1
Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.29.1_release_notes
Changes: https://hg.mozilla.org/projects/nss/shortlog/NSS_3_29_1_RTM
Approved by: ports-secteam (junovitch)