[Patch, Fortran] Fix misleading error for PROCEDURE(interface) and abstract types

[Daniel Kraft]

Hi,

when compiling this program:

   type, abstract :: t
   contains
     procedure(foobar), deferred :: x
   end type t
end

(I think it is legal but not yet supported by gfortran because of the 
deferred binding)

one gets "Error: Procedure with interface only allowed in abstract types 
at (1)" which was ok when it was written as by then abstract types were 
not implemented in gfortran; but now they are and this message is 
clearly misleading for the sample program.

I propose the attached patch to change the message.  I guess it is near 
to obvious, but I'd like to hear your comments on the message change 
anyways.  Ok to commit?  Or do you have suggestions for the new message?

I'll regression test and write a ChangeLog before committing, of course.

Yours,
Daniel

-- 
Done:     Arc-Bar-Cav-Sam-Val-Wiz, Dwa-Elf-Gno-Hum-Orc, Law-Neu-Cha, Fem-Mal
To go:    Hea-Kni-Mon-Pri-Ran-Rog-Tou
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