splash on latest checkouts

[bch]

--- __always_make_kernlib ---
nbmake: nbmake: don't know how to make splash_image.o. Stop

nbmake: stopped in /usr/obj/sys/arch/amd64/compile/GENERIC

ERROR: Failed to make all in "/usr/src/sys/arch/amd64/compile/obj/GENERIC"
*** BUILD ABORTED ***