Deprecating and removing old targets

[Tristan Gingold]

Hello,

after a short discussion at the GNU cauldron 2016, I'd like to hear opinion about removing old targets in bfd.
It is hard to know whether or not they are used, so if you are using an old target please speak up.

By old target, I mean any non-ELF target for which OS wasn't update in the last 10 years.
Without a complete search, I think about:

* all a.out targets
* all NetWare targets (nlm)
* all ecoff targets (alpha and mips)
* very old cpus: m88k, ns32k, i960, appolo, w65, we32k, pc532
* very old os: sunos-4, irix, sco, newsos, OSF, risc-ix
* very old formats: ieee-695, xsym, ppcboot, pef

I may forget some of them...

Targets I think we should keep:
* vax
* z80
* pdp11
* m68k, m68xx
* hppa
* alpha (elf, vms)
* dlx

Tristan.