graphicsmagick: Fix some options

[chdiza]

Some of the imagemagick options recently imported aren't graphicsmagick options. Delete them and their dependencies.

Some have different names, so fix them.

[chdiza]

See #22919 .

[MikeMcQuaid]

libxml2 comes with the system so I wonder if it'll use that version?

[chdiza]

@MikeMcQuaid The configure script said it found libxml2 when I tested, without any brewed libxml2 present. However, otool -L /usr/local/bin/gm doesn't show libxml2. Maybe it shouldn't?

[chdiza]

I tested again having brewed libxml2, and it still doesn't show up in otool -L.

[MikeMcQuaid]

Perhaps a runtime dlopen. Sounds like we can remove the dependency as a result.

[MikeMcQuaid]

@adamv @jacknagel Any ideas why we're getting a libtool dependency should be "depends_on 'libtool' => :build" audit failure with a :libltdl dependency (but only on 10.8/10.7)?

[MikeMcQuaid]

Merged, thanks @chdiza!

[jacknagel]

On 10.7/10.8 :libltdl turns into a plain libtool dep, but it doesn't have the :build flag (since it's not a build-time dep), but audit doesn't understand this. I've just been working around this in audit:

https://github.com/mxcl/homebrew/blob/3ab3c10968ae02796b7101b8147bb67ae3ecfa7d/Library/Homebrew/cmd/audit.rb#L156

[MikeMcQuaid]

@jacknagel Cool, was just checking it wasn't my being stupid.