[Bug libgcc/123976] GCC 15.2.0 (libgcc) does not build on PPC Mac OS X 10.5.8, Leopard, because of missing "md-unwind-def.h"

[vital.had at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123976

--- Comment #249 from Sergey Fedorov <vital.had at gmail dot com> ---
Thank you very much, Iain!