ABSTRACT interfaces + PROCEDURE declarations

[Tobias Schlüter]

Tobias Burnus wrote:
> From my side Janus' patch (with my test case and Janus' bind(C) check
> replaced by mine) is OK.
> 
> Janus: Can you write the ChangeLog, merge the patches* and send an email
> with your abstract interface patch to both fortran@ and to gcc-patches@?
> (* feel free to modify my test case or patch)
> 
> I think it can then be checked in.

I take it that Tobias has reviewed the technical aspects, but I'd still 
like to see testcases together with the patch.  Also, there are still a 
number of formatting issues.  In gfc_match_procedure() the indenting is 
consistently non-gnuish.  There's also some #if 0'd code and a TODO that 
makes me wonder if either that code should be merged with 
match_attr_spec() or the common functionality be extracted from both. 
The hunk to resolve_symbol() lacks vertical whitespace.

Cheers,
- Tobi