SVN r345236 fails to account for lib32 build pieces

[Michael Butler]

buildworld fails with ..

--- cddl/lib__L ---
Building
/usr/obj/usr/src/amd64.amd64/obj-lib32/cddl/lib/libzpool/vdev_initialize.o
--- lib__L ---
Building /usr/obj/usr/src/amd64.amd64/obj-lib32/lib/libsm/fscanf.o
Building /usr/obj/usr/src/amd64.amd64/obj-lib32/lib/libsm/fseek.o
--- all_subdir_lib/libomp ---
--- kmp_runtime.pico ---
/usr/src/contrib/openmp/runtime/src/kmp_runtime.cpp:8130:2: error:
"Unknown or unsupported OS"
#error "Unknown or unsupported OS"
 ^
1 error generated.
*** [kmp_runtime.pico] Error code 1

make[5]: stopped in /usr/src/lib/libomp
.ERROR_TARGET='kmp_runtime.pico'

	imb