Deprecate use of GNU DLD

GNU DLD is a dynamic link library. It is not maintained (the last release was in 1996), it's crufty (see the complaints about it in sysdll.c), nobody is using it for module support (see http://list-archive.xemacs.org/xemacs-patches/200307/msg00103.html for evidence), and I don't know how to maintain it since I don't have any systems with DLD, nor do I know anybody with such a system. I would like to deprecate GNU DLD for the next release of 21.5 and consider removing support for it entirely in 21.6 or 22.0, whichever comes next. Are there any objections? -- Jerry James http://www.ittc.ku.edu/~james/