Log Message:
Upgrade xemacs-current to 21.5.34

Since the non-{X11,lucid} toolkits have bitrotted, remove those
options, and rework options.mk like the editors/xemacs one.

Switching to the portable dumper and using system malloc obsoletes the
hacks.

Like XEmacs 21.4 and the emacsen, we need to build with -DTERMINFO for
proper console display.

Since Makefile content is minimal for xemacs-current{,-nox11}, keep
the pkgsrc nb revision centrally in Makefile.common.

Take maintainership.