MFH: r392273, r392758, r392759, r392761

• Update NSS and ca_root_nss to 3.19.2
• Update Firefox and gmp-api to 39.0
• Update Firefox ESR and libxul to 38.1.0
• Update Thunderbird to 38.1.0 [1]
• Stop regressing r380782 with harfbuzz/libvorbis deps

Changes: https://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.19.2_release_notes
Changes: https://github.com/mozilla/gmp-api/compare/Firefox38...Firefox39
Changes: https://www.mozilla.org/firefox/39.0/releasenotes/
Changes: https://www.mozilla.org/firefox/38.1.0/releasenotes/
Changes: https://www.mozilla.org/thunderbird/38.0.1/releasenotes/
Changes: https://www.mozilla.org/thunderbird/38.1.0/releasenotes/
PR: 201769 [1]
Submitted by: Christoph Moench-Tegeder <cmt@burggraben.net> (based on) [1]
Security: https://vuxml.freebsd.org/freebsd/44d9daee-940c-4179-86bb-6e3ffd617869.html
Approved by: ports-secteam (feld, delphij)