Note that Ethereal doesn't work on pre-X Mac OS, in case somebody sees
".macos" and thinks it'll work on OS 9 or earlier versions.
Explain that GLib and GTK+ now need to be shared libraries, and that
the GLib 1.x and GTK+ 1.x release tarballs were built with an older
version of libtool that didn't support building them as shared libraries
on OS X.
svn path=/trunk/; revision=10384