postprocess: execute packconfig.pl inside postprocess/packconfig directory

Change-Id: I2af8ab42eacdd1db7dfc6758c72fcd500b237ebc
diff --git a/postprocess/CustomTarget_config.mk b/postprocess/CustomTarget_config.mk
index f7b4744..284a43a 100644
--- a/postprocess/CustomTarget_config.mk
+++ b/postprocess/CustomTarget_config.mk
@@ -17,6 +17,7 @@ $(eval $(call gb_CustomTarget_register_targets,postprocess/config,\

$(call gb_CustomTarget_get_workdir,postprocess/config)/uiconfig.zip : $(SRCDIR)/postprocess/packconfig/packconfig.pl
	$(call gb_Output_announce,$(subst $(WORKDIR)/,,$@),$(true),PRL,2)
	$(PERL) $< -i $(OUTDIR)/xml/uiconfig -o $(dir $@)
	cd $(SRCDIR)/postprocess/packconfig \
	&& $(PERL) packconfig.pl -i $(OUTDIR)/xml/uiconfig -o $(dir $@)

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