MFH: r450128 r450491

ImageMagick7 to 7.0.7-2.

Disable FPX (FlashPix) support by default. This image format is really
rare these days coupled with that there are known CVE's in libfpx and
it doesn't seem to be maintained these days. It doesn't make sense to
keep it enabled by default anymore. [1]

Bump vapoursynth for sharedi library bumps in IM7.

PR: 222309 [1]
Submitted by: Anton Yuzhaninov <citrin+pr@citrin.ru> [1]

Update ImageMagick7 to 7.0.7-4.

PR: 222622
Security: 16fb4f83-a2ab-11e7-9c14-009c02a2ab30

Approved by: ports-secteam@ (implicit)