Meta/Make: support '-s'

Make

@@ -55,7 +55,7 @@ do
 	)
 done
 
-tests= jobs= oldtest= with_shell= testpen=
+tests= jobs= oldtest= with_shell= testpen= silent=
 clean=:
 
 determine_branch () {
@@ -111,6 +111,9 @@ do
 		'')	jobs=$1 ;;
 		esac
 		;;
+	-s)
+		silent=-s
+		;;
 	-noprove | --noprove)
 		oldtest=t
 		;;
@@ -268,6 +271,7 @@ unset	SSH_AGENT_PID SSH_CLIENT SSH_TTY SSH_AUTH_SOCK SSH_CONNECTION \
 
 ${make-make} \
      $jobs \
+     $silent \
      ETC_GITCONFIG=$prefix/etc/gitconfig \
      ${DEVELOPER:+"DEVELOPER=YesPlease"} \
      SPATCH_FLAGS="--all-includes --recursive-includes --patch ." \