To add to my findings from earlier today, note that these apparently exhibit somehow the "inverse" of the problem reported in this bug: Whenever I build Wine using the command lines I've shared, I can build 64-bit Wine ELF DLL files, but am unable to build 32-bit ones. Using openSUSE's packages, I can only build 32-bit DLLs, but no 64-bit ones. I'm not at all sure what's going on here.