binutils/stabs.c fixes

[Alan Modra]

On Tue, 30 Jan 2001, Steve deRosier wrote:

> 2001-01-24  Steve deRosier  <sderosier@vari-lite.com>
> 
>  * ieee.c (ieee_add_bb11): Don't check for backslashes
>    unless HAVE_DOS_BASED_FILE_SYSTEM is defined.

Thanks.  Committed.

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