Fix breakpoints when several source files have the same name

[Sébastien Granjoux]

Hi All,

I have updated my patch to fix a bug in gdb 6.8 that makes breakpoints 
inserted at the wrong place when a program has several files with the 
same base name (in different directories).

I have checked my fix on the latest development version and updated it 
because the bug has moved a bit. Moreover I have reduced the number of 
calls of the symtab_to_fullname function as requested.

There is a bug report opened about this here:
http://sourceware.org/bugzilla/show_bug.cgi?id=9583

Regards,

Sébastien
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