Android.mk: Add dependency from optimizer file to amd-shader-ballot-insts.inc (#2883)

This is required to fix the NDK build.
diff --git a/Android.mk b/Android.mk
index c7f8e47..2eb4368 100644
--- a/Android.mk
+++ b/Android.mk
@@ -250,6 +250,8 @@
 	$(1)/spv-amd-shader-ballot.insts.inc \
 	$(1)/spv-amd-shader-explicit-vertex-parameter.insts.inc \
 	$(1)/spv-amd-shader-trinary-minmax.insts.inc
+$(LOCAL_PATH)/source/opt/amd_ext_to_khr.cpp: \
+	$(1)/spv-amd-shader-ballot.insts.inc
 endef
 $(eval $(call gen_spvtools_grammar_tables,$(SPVTOOLS_OUT_PATH)))