partial backport of 3f93bfbb207b8e73f5f39afdf1c6f4a96038d2e4
Fix Makefile dependencies

Index: bundles/Makefile.bundles
--- bundles/Makefile.bundles.orig
+++ bundles/Makefile.bundles
@@ -75,13 +75,10 @@ $(SRC_DIR)/$(ARCHIVE).cma: $(patsubst %,$(SRC_DIR)/%.c
 $(SRC_DIR)/$(ARCHIVE).cmxa: $(patsubst %,$(SRC_DIR)/%.cmx,$(OBJS))
 	$(OCAMLOPT_CMD) -a $^ -o $@
 
-$(SRC_DIR)/$(LIBRARY).a \
-$(SRC_DIR)/dll$(LIBRARY)_stubs.so \
 $(SRC_DIR)/lib$(LIBRARY)_stubs.a: \
 	$(patsubst %,$(SRC_DIR)/%_stubs.o,$(C_OBJS))
 	$(OCAMLMKLIB_CMD) -o $(SRC_DIR)/$(LIBRARY)_stubs $^
 
-$(SRC_DIR)/$(LIBRARY).a \
 $(SRC_DIR)/dll$(LIBRARY)_stubs.so: $(SRC_DIR)/lib$(LIBRARY)_stubs.a
 
 %.ml: %.mll .prepare
