Deprecating and removing old targets

[Maciej W. Rozycki]

On Mon, 12 Sep 2016, Tristan Gingold wrote:

> * all ecoff targets (alpha and mips)

 The ECOFF format is used by some old MIPS firmware for bootable images.  

 People have usually been using a third-party `elf2ecoff' tool rather than 
our `objcopy' to convert binaries, but I still think it makes sense to 
keep support in BFD so that images already made can be examined or there's 
an alternative conversion method available, in case of troubles or just 
for general interest.

 NB MIPS/ECOFF support has already been removed from GAS, LD and GDB, it's 
just binutils/ that has it still retained.  That makes it a tad of a 
challenge of course to verify remaining support hasn't regressed.

  Maciej