Attempt to improve gallery generation dependencies.

Change-Id: Iab196e87e0eb4b063d77fe4af10c58b8355665c4
Reviewed-on: https://gerrit.libreoffice.org/20210Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

solenv/gbuild/Gallery.mk

@@ -68,7 +68,10 @@ $(dir $(call gb_Gallery_get_target,$(1)))%/.dir :
 	$(if $(wildcard $(dir $@)),,mkdir -p $(dir $@))
 
 $(call gb_Gallery_get_target,%) : \
-		$(call gb_Executable_get_runtime_dependencies,gengal)
+		$(call gb_Executable_get_runtime_dependencies,gengal) \
+		$(INSTDIR)/program/$(call gb_Helper_get_rcfile,gengal) \
+	    $(call gb_ComponentTarget_get_target,ucb/source/core/ucb1) \
+	    $(call gb_ComponentTarget_get_target,ucb/source/ucp/file/ucpfile1)
 	$(call gb_Gallery__command,$@,$*)
 
 $(call gb_Gallery__get_final_target,%) :