Record external/liborcus/version.patch.0 as covered upstream

Change-Id: I006a16cfc83e5b03408a2e772e752bb210901686
Reviewed-on: https://gerrit.libreoffice.org/61380
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

external/liborcus/UnpackedTarball_liborcus.mk

@@ -15,6 +15,9 @@ $(eval $(call gb_UnpackedTarball_set_patchlevel,liborcus,1))
 
 $(eval $(call gb_UnpackedTarball_update_autoconf_configs,liborcus))
 
+# * external/liborcus/version.patch.0 covered by upstream
+#   <https://gitlab.com/orcus/orcus/commit/0dfa88f2adca7887dbe44bdb7025985777c89673> "Remove unused
+#   VERSION file":
 $(eval $(call gb_UnpackedTarball_add_patches,liborcus,\
 	external/liborcus/0001-workaround-a-linking-problem-on-windows.patch \
 	external/liborcus/rpath.patch.0 \