m68k: fpsp040: Remove meaningless $(OS_OBJS)

'git grep OS_OBJS' hits only this line. $(OS_OBJS) is just empty.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20210331144336.25628-1-masahiroy@kernel.orgSigned-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/fpsp040/Makefile

@@ -12,5 +12,3 @@ obj-y    := bindec.o binstr.o decbin.o do_func.o gen_except.o get_op.o \
 	    x_unfl.o x_unimp.o x_unsupp.o bugfix.o skeleton.o
 
 EXTRA_LDFLAGS := -x
-
-$(OS_OBJS): fpsp.h