MFH: r386162

• Update NSS and ca_root_nss to 3.19
• Update Firefox to 38.0
• Update Firefox ESR and libxul to 31.7.0
• Update Thunderbird to 31.7.0
• Update Enigmail to 1.8.2

Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes
Changes: https://www.mozilla.org/firefox/38.0/releasenotes/
Changes: https://www.mozilla.org/firefox/31.7.0/releasenotes/
Changes: http://sourceforge.net/p/enigmail/bugs/search/?q=status%3Afixed+%26%26+_fixed%3A1.8.1
Security: https://vuxml.freebsd.org/freebsd/d9b43004-f5fd-4807-b1d7-dbf66455b244.html
Approved by: ports-secteam (delphij)