I got a report that the 32bit builds are broken. This seems to be caused
by padding inserted (or not) into the structures and depends on a
compiler version. The error messages may look cryptic, but if you see
something like

ioctl.h:570:1: note: in expansion of macro 'BUILD_ASSERT'
 BUILD_ASSERT(sizeof(struct btrfs_ioctl_received_subvol_args) == 200);

that means that the given structure has an unexpected size. Fixing that
properly will probably lead to some tricks to force the exact size
regardless of arch bits and compiler.
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