asmixer fails to cross build from source, because it strips with the
build architecture strip via "install -s" during make install. Beyond
breaking cross compilation, this also prevents generation of -dbgsym
packages and makes DEB_BUILD_OPTIONS=nostrip ineffective. I suggest
dropping the -s flag. Doing so fixes all of the above as dh_strip knows
very well when and how to strip. I'm attaching a patch for your
convenience.

Helmut