When the various loaders under stand/efi are built, the resulting
binaries differ over multiple runs, even if WITH_REPRODUCIBLE_BUILD is
used. This is caused by lld multithreading and the custom linker scripts
for the loaders, and affects the following binaries:
* loader_4th.efi
* loader_4th.sym
* loader_4th.sym.full
* loader_lua.efi
* loader_lua.sym
* loader_lua.sym.full
* loader_simp.efi
* loader_simp.sym
* loader_simp.sym.full
Work around this by disabling lld threading for these binaries.
Reviewed by: emaste
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D46271
(cherry picked from commit f5ce3f4ef562ea9fc4d8f9c13c268f48a5bacba7)
85434cac6e