poppler: Drop dependency on gtk2

[raimue (Rainer Müller)]

The poppler port does not really need to depend on gtk2. There is only one binary linked against libgtk, which is a demo and can be removed without loosing functionality (actually, it always resulted in a "Segmentation fault" in my tests):

$ port contents poppler |grep -E '/opt/local/(bin|lib/.*\.dylib)' |xargs otool -L |grep -B13 gtk
/opt/local/bin/poppler-glib-demo:
...
	/opt/local/lib/libgtk-x11-2.0.0.dylib (compatibility version 2401.0.0, current version 2401.8.0)

To be honest, this change does not cut the dependency tree more than gtk2 itself. But as gtk2 is a big port, I think the reduction is significant enough to vindicate this change.

[ryandesign (Ryan Carsten Schmidt)]

Isn't this Dave Evans' port?

[drkp (Dan Ports)]

I haven't tried the patch at all, but it'd be great to drop this dependency if possible -- this makes a number of ports (e.g. texlive) depend needlessly on gtk, and it'd be nice if that weren't the case.

[drkp (Dan Ports)]

This seems to work fine for me, and it's great to reduce the number of dependencies, so I committed in in r90937.

[drkp (Dan Ports)]

Actually, this helps more than I expected. It removes a total of 35 dependencies from the texlive dependency tree, including things like pango, cairo, gdk-pixbuf2, gtk-doc and friends, and a dozen or so xorg libraries. Not bad.

[ryandesign (Ryan Carsten Schmidt)]

This also has the effect of removing the indirect glib2 dependency, which was needed to build the poppler-glib library, so glib2 has to go back in. See #32924 in which this and several other dependencies will be added.