Revision 410638

MFH: r408984 r410176 r410186

www/firefox: simplify upstream graphite2 update-helper

www/firefox{,-esr}: update to 45.0 (rc2) / 38.7.0

Prepare www/firefox a bit for ESR45:
- [e10s] Make layers.progressive-paint;true work at least on 11.0-CURRENT
- Chase bundled versions for system dependencies [1]
- Drop unused/broken system opus and speex support

Changes:	https://www.mozilla.org/firefox/45.0/releasenotes/
Changes:	https://www.mozilla.org/firefox/38.7.0/releasenotes/
PR:		207686 [1]
Security:	2225c5b4-1e5a-44fc-9920-b3201c384a15
Approved by:	ports-secteam (feld, merge conflict blanket)