New port: mac68ksf - Macintosh 68k softfloat.This commit is all the Makefile glue for the new port which is the mac68kport with MKSOFTFLOAT set to "yes".As posted here:https://mail-index.netbsd.org/port-mac68k/2025/10/14/msg001037.html
Merge the new gdtoa: Note that the built-in tests fail the same way as withthe old gdtoa.
branches: 1.1.1;Initial revision