samples/seccomp: Fix hostprogs variable

In f6041c1d, a separate SAMPLES_SECCOMP option was added. This changed
hostprogs-y to hostprogs-m, so adjust it.
Signed-off-by: Ricky Zhou <rickyz@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>

samples/seccomp/Makefile

@@ -36,13 +36,13 @@ HOSTLOADLIBES_bpf-direct += $(MFLAG)
 HOSTLOADLIBES_bpf-fancy += $(MFLAG)
 HOSTLOADLIBES_dropper += $(MFLAG)
 endif
-always := $(hostprogs-y)
+always := $(hostprogs-m)
 else
 # MIPS system calls are defined based on the -mabi that is passed
 # to the toolchain which may or may not be a valid option
 # for the host toolchain. So disable tests if target architecture
 # is MIPS but the host isn't.
 ifndef CONFIG_MIPS
-always := $(hostprogs-y)
+always := $(hostprogs-m)
 endif
 endif