build zpool command as 64-bit binary
After 11682, the zpool command is linked against libzpool, but apparently there is no 32-bit build of libzpool for sparc. So we have two alternate options - either build 32-bit libzpool for sparc or build zpool command as 64-bit binary. I'd vote for switching zpool command to 64-bit as clearly there is no need for another 32-bit library.
Testing done so far: