Update ImageMagick to 6.9.0.4.

- Normalize the ImageMagick library name so it stays the same regardless of
  what the 16-bit and HDRI option are set to [1]. Teach cmake to look for
  the new name. Bump ports that link to the libraries due to this.
- As a result do away with the "HALFSUPPORTED" option block, and list
  16-bit and HDRI with the other options.
- ImageMagick ships a basic SVG plugin when not using librsvg2 for SVG
  support. This basic SVG plugin needs libxml2 to work [2]. Make libxml2
  a mandatory dependency (instead of only when the SVG option was selected).
- Don't touch .keep files in the modules directory, there files there so
  it useless.

PR:		194949 [1]
PR:		195227 [2]
Requested by:	many [1]
Submitted by:	software-freebsd@interfasys.ch [2]

0 files changed, 0 insertions, 0 deletions