We'd like to remove the gcc-multilib package from unstable. Instead,
targeted toolchains such as i686-linux-gnu-gcc should be used. In this
case, we are in the fortunate position that syslinux uses the 32bit
toolchain as freestanding. The standard gcc package includes this
functionality (including -m32) as long as no libc is being used. As
syslinux builds 32bit firmware, that's the case and we may drop both
gcc-multilib and libc6-dev-i386 from Build-Depends. Using reproducible
builds, we may see that output artifacts are entirely unaffected by this
change. I'm attaching a patch for your convenience. While I consider it
safe for inclusion in trixie (due to reproducibility), I recommend
deferring it to forky to avoid disrupting the release process.

Helmut