[Patch] Improve path lookup of absolute source file

[Eli Zaretskii]

> Cc: gdb-patches@sourceware.org, Daniel Jacobowitz <drow@false.org>,         Joel Brobecker <brobecker@gmail.com>
> From: Tom Tromey <tromey@redhat.com>
> Date: Fri, 24 Apr 2009 08:52:17 -0600
> 
> Do you have a copyright assignment on file?  This patch is big enough
> to require one.

Today's copyright.list doesn't seem to show Francois's name, FWIW.