[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"

[Peter_Dyballa at web dot de]

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

--- Comment #101 from Peter Dyballa <Peter_Dyballa at web dot de> ---
The build build the docs with makeinfo 4.8 and failed in libgcc due to missing
symlink "md-unwind-def.h".

Going to un-change the three .MK files and starting anew.