binutils/stabs.c fixes

[Alan Modra]

On Tue, 23 Jan 2001, Steve deRosier wrote:

> it segfaults in ieee.c ieee_start_compilation_unit line 4943 during the call
> to strrchr.

I can't see how this can happen unless you either have a NULL filename,
(which shouldn't happen as far as I can see from looking at debug.c), or
if you have a compiler bug.

> >  * stabs.c: Update copyright. Include "filenames.h".
> >  * stabs.c (parse_stab): Use IS_ABSOLUTE_PATH. Ignore N_WARNING stabs.

Committed.

Alan Modra
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