[SPARC]: block/ needed in final image link

With this fix, sparc links vmlinuz again using crosstool. Without this
fix, the final link fails missing several dozen dozen symbols, beginning
with:

kernel/built-in.o(.text+0x6fd0): In function `do_exit':
: undefined reference to `exit_io_context'

(exit_io_context is defined in block/ll_rw_blk.c).

Signed-off-by: Paul Jackson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/sparc/Makefile

···
 # Renaming is done to avoid confusing pattern matching rules in 2.5.45 (multy-)
 INIT_Y		:= $(patsubst %/, %/built-in.o, $(init-y))
 CORE_Y		:= $(core-y)
-CORE_Y		+= kernel/ mm/ fs/ ipc/ security/ crypto/
+CORE_Y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
 CORE_Y		:= $(patsubst %/, %/built-in.o, $(CORE_Y))
 DRIVERS_Y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
 NET_Y		:= $(patsubst %/, %/built-in.o, $(net-y))