[Patch] add support for alpha/vms archives

[h.becker]

Tristan Gingold wrote:
> Hartmut,
> 
> please do be too picky, as this is a first implementation that will be improved.  I plan to submit my new
> version of the alpha vms back-end and archives were part of that.  I also plan to support ia64.
Tristan,
I didn't want to appear picky at all. I just scanned the submitted 
sources and some things came to mind.

>> Also, although not often used, an object file can contain more than one object module.
> 
> Interesting.  How can such an object file be built ?
I know that DEC Fortran did this, I know you can just concatenate object 
  files with the append command.

> The purpose of this is to be able to handle text libraries.  That useful to read header or help files on
> unix.
I think I understand, but the text libraries seem to handled the same as 
archives. Maybe nobody tries nm or objdump on them.

Hartmut