[Bug libgcc/58710] HAVE_GETIPINFO is incorrectly set on Mac OS X 10.4

[misty at brew dot sh]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58710

--- Comment #1 from Misty De Meo <misty at brew dot sh> ---
It looks like the check was added in a4a5a77adfc9c28d6963e5ae054c997d57cfc7fa
(http://repo.or.cz/w/official-gcc.git/commitdiff/a4a5a77adfc9c28d6963e5ae054c997d57cfc7fa),
which didn't touch the existing behaviour that was already doing some
definition of whether _Unwind_GetIPInfo was available or not.