cross-compiling for i386 on amd64 fails

From: Michael Butler via freebsd-current <freebsd-current_at_freebsd.org>
Date: Tue, 16 Nov 2021 04:34:25 UTC
Haven't had time to identify which change caused this yet but I now get ..

===> lib/libsbuf (obj,all,install)
===> cddl/lib/libumem (obj,all,install)
===> cddl/lib/libnvpair (obj,all,install)
===> cddl/lib/libavl (obj,all,install)
ld: error: /usr/obj/usr/src/i386.i386/tmp/usr/lib/libspl.a(assert.o) is 
incompatible with elf_i386_fbsd
===> cddl/lib/libspl (obj,all,install)
cc: error: linker command failed with exit code 1 (use -v to see invocation)
--- libavl.so.2 ---
*** [libavl.so.2] Error code 1

make[4]: stopped in /usr/src/cddl/lib/libavl

	imb