[Bug modula2/108182] gm2 driver mishandles target and multilib options

[gaius at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108182

--- Comment #9 from Gaius Mulley <gaius at gcc dot gnu.org> ---
Created attachment 54214
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54214&action=edit
Potential fix for target multilib_dir handling -m and -f (version 3)

version3 work in progress, implemented using lang-specs.h and gm2spec.cc.