feat(iidx 20-26): Hook new "HD era scaling" module

Replace the old module, re-use the configuration for now to
avoid introducing breaking changes in the configuration API.

This can be further cleaned up, once the monolithic
iidxhook-util/d3d9 module is further broken up.

src/main/iidxhook6/Module.mk

@@ -7,6 +7,7 @@ deplibs_iidxhook6   := \
     avs \
 
 libs_iidxhook6      := \
+    iidxhook-d3d9 \
     iidxhook-util \
     ezusb-emu \
     ezusb-iidx-16seg-emu \