Makefile tweak, setup depends on Setup.hs

Makefile

@@ -25,7 +25,7 @@ DIST_STAMP=$(DISTLOC)/Cabal-$(VERSION).tar.gz
 COMMA=,
 VERSION_VALUE=$(subst .,$(COMMA),$(VERSION))
 
-setup: $(SOURCES)
+setup: $(SOURCES) Setup.hs
 	-mkdir -p dist/setup
 	$(HC) $(GHCFLAGS) --make -DCABAL_VERSION=$(VERSION_VALUE) -i. -odir dist/setup -hidir dist/setup Setup.hs -o setup