[Bug bootstrap/117399] make all-target-libgcc fails because gcc/as line 114 is "exec $original" and $original is --64

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117399

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
Note that r15-2368-g6a55ff29578e8a makes the error better.