win32: improve version.o dependency

Actually, version.rc doesn't need config-host.mak but config-host.h, fix it.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile

@@ -116,7 +116,7 @@ ui/vnc.o: QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
 
 bt-host.o: QEMU_CFLAGS += $(BLUEZ_CFLAGS)
 
-version.o: $(SRC_PATH)/version.rc config-host.mak
+version.o: $(SRC_PATH)/version.rc config-host.h
 	$(call quiet-command,$(WINDRES) -I. -o $@ $<,"  RC    $(TARGET_DIR)$@")
 
 version-obj-$(CONFIG_WIN32) += version.o