Turn dropbearmulti into a real target so we don't constantly re-link it

Makefile.in

@@ -175,10 +175,10 @@ ifeq ($(MULTI),1)
 	CFLAGS+=$(addprefix -DDBMULTI_, $(PROGRAMS)) -DDROPBEAR_MULTI
 endif
 
-dropbearmulti: multilink 
+dropbearmulti$(EXEEXT): $(HEADERS) $(MULTIOBJS) $(LIBTOM_DEPS) Makefile
+	$(CC) $(LDFLAGS) -o [email protected] $(MULTIOBJS) $(LIBS)$
 
-multibinary: $(HEADERS) $(MULTIOBJS) $(LIBTOM_DEPS) Makefile
-	$(CC) $(LDFLAGS) -o dropbearmulti$(EXEEXT) $(MULTIOBJS) $(LIBS)
+multibinary: dropbearmulti$(EXEEXT)
 
 multilink: multibinary $(addprefix link, $(PROGRAMS))