Makefile: fix qga dependencies

.c files include .h files, so .o depends on .h,
and the linked result depends on .o.
We got it wrong for qga rules, fix it up.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

Makefile

@@ -208,11 +208,12 @@ test-visitor: test-visitor.o $(qobject-obj-y) $(qapi-obj-y) $(tools-obj-y) $(qap
 test-qmp-commands.o: $(addprefix $(qapi-dir)/, test-qapi-types.c test-qapi-types.h test-qapi-visit.c test-qapi-visit.h test-qmp-marshal.c test-qmp-commands.h) $(qapi-obj-y)
 test-qmp-commands: test-qmp-commands.o $(qobject-obj-y) $(qapi-obj-y) $(tools-obj-y) $(qapi-dir)/test-qapi-visit.o $(qapi-dir)/test-qapi-types.o $(qapi-dir)/test-qmp-marshal.o module.o
 
-QGALIB_GEN=$(addprefix $(qapi-dir)/, qga-qapi-types.c qga-qapi-types.h qga-qapi-visit.c qga-qmp-marshal.c qga-qmp-commands.h)
-$(QGALIB_GEN): $(GENERATED_HEADERS)
-$(qga-obj-y) qemu-ga.o: $(QGALIB_GEN)
+QGALIB_OBJ=$(addprefix $(qapi-dir)/, qga-qapi-types.o qga-qapi-visit.o qga-qmp-marshal.o)
+QGALIB_GEN=$(addprefix $(qapi-dir)/, qga-qapi-types.h qga-qapi-visit.h qga-qmp-commands.h)
+$(QGALIB_OBJ): $(QGALIB_GEN) $(GENERATED_HEADERS)
+$(qga-obj-y) qemu-ga.o: $(QGALIB_GEN) $(GENERATED_HEADERS)
 
-qemu-ga$(EXESUF): qemu-ga.o $(qga-obj-y) $(qapi-obj-y) $(tools-obj-y) $(qobject-obj-y) $(version-obj-y) $(addprefix $(qapi-dir)/, qga-qapi-visit.o qga-qapi-types.o qga-qmp-marshal.o)
+qemu-ga$(EXESUF): qemu-ga.o $(qga-obj-y) $(qapi-obj-y) $(tools-obj-y) $(qobject-obj-y) $(version-obj-y) $(QGALIB_OBJ)
 
 QEMULIBS=libhw32 libhw64 libuser libdis libdis-user