manu/Makefile: run a recursive make on all subdirectories

- boom/boom-config.in: new command "manu" to list the manufacturers
- manu/Makefile: run make for targets "all", "test", "sane", and "spotless"
  on each manufacturer directory

boom/boom-config.in

@@ -30,6 +30,8 @@ while [ "$1" ]; do
 	    for n in $DIST; do echo "$base/dist/$n/db/all.dsc"; done;;
 	chr)
 	    for n in $MANU; do echo "$base/manu/$n/$n.chr"; done;;
+	manu)
+	    echo $MANU;;
 	*)
 	    usage;;
     esac

boom/manu/Makefile

@@ -0,0 +1,11 @@
+DIRS = $(shell ../boom-config manu)
+
+.PHONY:	all test sane spotless $(DIRS)
+
+all:	$(DIRS)
+
+$(DIRS):
+	$(MAKE) -C $@
+
+test sane spotless:
+	for n in $(DIRS); do $(MAKE) -C $$n $@ || exit 1; done