Bug#973395: clang-10: Unable to package LLVM/Clang on Buster (for backports) - libffi error

[Alexander Motzkau]

I hit the same bug when building for i386 (inside an i386 docker container)
on an amd64 system. Even though it's running inside an i386 environment,
the build system detects the host architecture and suddenly starts compiling
for that, where it doesn't find the corresponding libffi.

My solution was simple: Execute the build command with the linux32 wrapper.

Regards,
Alex