Fix g++.dg/abi/forced.C for ARM EABI

[Benjamin Kosnik]

> 2008-07-07  Joseph Myers  <joseph@codesourcery.com>
> 
> 	* libsupc++/unwind-cxx.h (__is_gxx_forced_unwind_class,
> 	__GXX_INIT_FORCED_UNWIND_CLASS): Define for ARM EABI unwinder.
> 	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION): Call
> 	__GXX_INIT_FORCED_UNWIND_CLASS for forced unwind with ARM EABI
> 	unwinder.
> 	* libsupc++/eh_arm.cc (__cxa_type_match): Use
> 	__is_gxx_forced_unwind_class to check for forced unwind.

This looks ok to me. Thanks for fixing this.

-benjamin