Log Message:
emacs20: retire elaborate logic to match versions of NetBSD below 1.7

older binutils worked fine without this option, and it was a performance
hit, but it's unrealistic to see anyone using such old binutils today.

not matching some operating systems will cause runtime crashes.

forgotten to apply patch in PR pkg/43091: emacs20 doesn't work
(..on linux, which doesn't match the elaborate logic)

bump PKGREVISION as it is only apparent at runtime.