[patch] Fix vDSO l_name for GDB's: Can't read pathname for load map: Input/output error.

[Roland McGrath]

> FYI, I recently encountered a core file (from Solaris 10) where the
> name of ld.so was a pointer into ld.so's text segment... so this isn't
> always enough, but I think the best we can do there is warn.  I never
> did figure out how that situation came to pass.

Odd.  Ordinarily in GNU, it points to executable's PT_INTERP string.