gtk2 package changes

[Matthias Clasen]

I've fixed the gtk2 wrt to being parallel-installable on biarch
systems like ppc/ppc64. The changes involved moving the arch-dependent
config files to another directory and adding -32/-64 suffixes to the
installed binaries. This means in particular that packages which install
input modules or pixbuf loaders need changes to their postinstall and
postuninstall hooks. To make this easier, the gtk2 package now installs
two scripts, update-gdk-pixbuf-loaders and update-gtk-immodules, which
expect to be given the host triplet and figure out the binary to call
and the config file location based on that.
 
So, if one of your packages installs an input module or pixbuf loader,
please update the post hooks accordingly. You can look at librsvg2 or
im-sdk for examples.
                                                                                
Regards, Matthias