Move adsbus into its own dir.

adsbus/Makefile

@@ -0,0 +1,15 @@
+CC ?= clang
+CFLAGS ?= -Wall -Werror -O4 -g --std=gnu11 --pedantic-errors -fPIE -pie -fstack-protector-strong
+LDFLAGS ?= $(CFLAGS) -Wl,-z,relro -Wl,-z,now
+LIBS ?= -luuid -ljansson
+
+all: adsbus
+
+clean:
+	rm -f *.o adsbus
+
+%.o: %.c *.h
+	$(CC) -c $(CFLAGS) $< -o $@
+
+adsbus: adsbus.o receive.o send.o incoming.o outgoing.o airspy_adsb.o beast.o json.o raw.o stats.o wakeup.o common.o
+	$(CC) $(LDFLAGS) -o adsbus adsbus.o receive.o send.o incoming.o outgoing.o airspy_adsb.o beast.o json.o raw.o stats.o wakeup.o common.o $(LIBS)