[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"

[schwab--- via Gcc-bugs]

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

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
md-unwind-def.h should be linked to libgcc/config/no-unwind.h by
libgcc/Makefile.