emul-linux-x86-opengl does not contain any files, when abi_x86_32 is activated. All dependencies should resolve their dependencies independently, pulling in everything that's needed, which renders the dependency on xlibs obsolete.
emul-linux-x86-xlibs is itself empty under abi_x86_32, so the same can be said about it as well. I've filed bug 500314 to track -opengl and bug 500316 to track -xlibs.
The emul-linux-x86 packages have been removed.