MFH: r401981, r402196
gecko: catch up with 2015-11-03 release train
- Update NSPR to 4.10.10 [1]
- Update NSS to 3.20.1 [2]
- Update Firefox ESR and libxul to 38.4.0
- Update Firefox to 42.0 [2]
- Update SeaMonkey to 2.39
Changes: http://mozilla.6506.n7.nabble.com/ANNOUNCE-NSPR-4-10-10-Release-td346822.html
Changes: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.20.1_release_notes
Changes: https://www.mozilla.org/en-US/firefox/42.0/releasenotes/
Changes: http://www.seamonkey-project.org/news#2015-11-08
PR: 204277 [1], 204332 [2], 203099
Submitted by: swills, Christoph Moench-Tegeder
Security: 9d04936c-75f1-4a2c-9ade-4c1708be5df9
Approved by: ports-secteam (feld), portmgr (erwin)