2.2 moduleset updates

[Antoine Martin]

Tracker ticket for the moduleset changes and those that may need to be backported. (see #1404 for 2.0, #1501 for 2.1)

[Antoine Martin]

• r17010: pyobjc 4.0
• r17011: ffmpeg 3.3.4

Both could be backported but the 1.x branch is in life support mode for macos, so this probably won't happen.

[Antoine Martin]

• r17216: ffmpeg 3.4, cryptography 2.1.1
• r17121: pillow 4.3.0
• r17229: Cython 0.27.2

[Antoine Martin]

Over 20 libraries updated in r17289, with only minor fixups in r17290 (pypi requires SSL) and r17291 (strip URL).

It all still builds and runs fine - I was half expecting something to go wrong.

@smo: mostly a FYI.

Will continue in #1678 for the next release.

[Antoine Martin]

• r17292: zlib 1.2.11, libtasn1 4.12, libwebp 0.6.0
• r17338: Cython 0.27.3
• r17463: orc 0.4.28
• r17468: webp re-added (see #1694), r17541 webp 0.6.1

[Antoine Martin]

Follow up: #1678

Packaging for python3: #1575

[Antoine Martin]

r17564: python-cryptography 2.1.4