MODSIGN: Fix kbuild output when using default extra_certificates

Reported-by: Peter Foley <pefoley2@verizon.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Acked-by: Peter Foley <pefoley2@verizon.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/kernel/Makefile b/kernel/Makefile
index 0bd9d43..17f90b6 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -136,8 +136,12 @@
 #
 # Pull the signing certificate and any extra certificates into the kernel
 #
+
+quiet_cmd_touch = TOUCH   $@
+      cmd_touch = touch   $@
+
 extra_certificates:
-	touch $@
+	$(call cmd,touch)
 
 kernel/modsign_certificate.o: signing_key.x509 extra_certificates