- Update mozilla-gtk3_20.patch for Firefox 46.0 (sync to latest
version from Fedora).

- update to Firefox 46.0 (boo#977333)
* Improved security of the JavaScript Just In Time (JIT) Compiler
* WebRTC fixes to improve performance and stability
* Added support for document.elementsFromPoint
* Added HKDF support for Web Crypto API
* requires NSPR 4.12 and NSS 3.22.3
* added patch to fix unchecked return value
mozilla-check_return.patch
* Gtk3 builds not supported at the moment
security fixes:
* MFSA 2016-39/CVE-2016-2804/CVE-2016-2806/CVE-2016-2807
(boo#977373, boo#977375, boo#977376)
Miscellaneous memory safety hazards
* MFSA 2016-40/CVE-2016-2809 (bmo#1212939, boo#977377)
Privilege escalation through file deletion by Maintenance Service updater
(Windows only)
* MFSA 2016-41/CVE-2016-2810 (bmo#1229681, boo#977378)
Content provider permission bypass allows malicious application
to access data (Android only)
* MFSA 2016-42/CVE-2016-2811/CVE-2016-2812
(bmo#1252330, bmo#1261776, boo#977379)
Use-after-free and buffer overflow in Service Workers
* MFSA 2016-43/CVE-2016-2813 (bmo#1197901, bmo#2714650, boo#977380)
Disclosure of user actions through JavaScript with motion and
orientation sensors (only affects mobile variants)
* MFSA 2016-44/CVE-2016-2814 (bmo#1254721, boo#977381)
Buffer overflow in libstagefright with CENC offsets