[PATCH/RFA]: Adapt solib-svr4.c for recent gdbarch_data changes

[Andrew Cagney]

> Discovered this moring that my gdb was crashing.  Seems like we have
> an initialization cycle here.  I think that after Andrew's patch we
> can simplify init_fetch_link_map_offsets as in the attached patch.

Oops! The target I tried this on sets the link map offset.
(So this also means that the cycle test works?)

> OK to check this in?

> 	* solib-svr4.c (init_fetch_link_map_offsets): Simply return
> 	legacy_fetch_link_map_offsets.  Adjust comment to reflect reality
> 	after Andrew's 2002-06-08 gdbarch change.

I think it might have to go under an ``obvious fix''.  I definitly broke 
the code and the way you've changed things is the only way to do it.

I think I'll update the [about to commit] doco to reflect this.

Andrew