basilisk/moebius for XP (20180616)

New build of post-deprecated basilisk/moebius for XP!
* Notice: This repo will not be built on regular schedule.

Test binary:
Win32 http://o.rthost.cf/basilisk/basilisk55-win32-git-20180616-de24cec63-xpmod.7z
Win64 http://o.rthost.cf/basilisk/basilisk55-win64-git-20180616-de24cec63-xpmod.7z

Repo: https://github.com/roytam1/basilisk55

Repo changes:
- cherry-picked mozilla upstream changes: bug1338404, bug1110928, bug1332745, bug835981, bug1331414, bug1332812 (6feeca67b)
- ffvpx: update to 3.4.2 with extended codecs (893d9859d)
- nsWebPDecoder: pluged up memory leak by properly calling WebPFreeDecBuffer() before WebPIDelete(). (26e6ef5ea)
- icu: cve fixes of CVE-2017-7867, CVE-2017-7868, CVE-2017-14952, CVE-2017-15422 (b7fb50397)
- NSS: update to 3.36.4 (e9b13dc7b)
- harfbuzz: update to 1.5.1 (7d954d472)
- libs: update OTS to 5.2.0, woff2 to fx57-bundled version, brotli to 1.0.1, also modify mfbt/Compression for LZ4 and netwerk and inspector for brotli API changes. (94dbc3aac)
- cherry-picked mozilla upstream changes: bug1335829, bug1336216, bug1319771, bug1329179, bug1330823, bug1334085, bug1312049, bug1335070, bug1336018 (de24cec63)

* please don't classify these changes as "security update" as a whole, because they aren't. Changes are experimental as usual.