Disable dexpreopting when TARGET_BUILD_APPS is used.

This moves the condition from Soong to make, so that
config.UnbundledBuild() in Soong no longer implies disabling
dexpreopting.

Test: TH, in particular builds green on ub-launcher3-master
Bug: 157549171
Change-Id: I7273be8591c9d627d89e033b641139dacc275806
diff --git a/core/dex_preopt_config.mk b/core/dex_preopt_config.mk
index 56f0a62..7d7d526 100644
--- a/core/dex_preopt_config.mk
+++ b/core/dex_preopt_config.mk
@@ -1,5 +1,14 @@
 DEX_PREOPT_CONFIG := $(SOONG_OUT_DIR)/dexpreopt.config
 
+ENABLE_PREOPT := true
+ifneq (true,$(filter true,$(WITH_DEXPREOPT)))
+  ENABLE_PREOPT :=
+else ifneq (true,$(filter true,$(PRODUCT_USES_DEFAULT_ART_CONFIG)))
+  ENABLE_PREOPT :=
+else ifneq (,$(TARGET_BUILD_APPS))
+  ENABLE_PREOPT :=
+endif
+
 # The default value for LOCAL_DEX_PREOPT
 DEX_PREOPT_DEFAULT ?= true
 
@@ -60,7 +69,7 @@
 
   $(call json_start)
 
-  $(call add_json_bool, DisablePreopt,                           $(call invert_bool,$(and $(filter true,$(PRODUCT_USES_DEFAULT_ART_CONFIG)),$(filter true,$(WITH_DEXPREOPT)))))
+  $(call add_json_bool, DisablePreopt,                           $(call invert_bool,$(ENABLE_PREOPT)))
   $(call add_json_list, DisablePreoptModules,                    $(DEXPREOPT_DISABLED_MODULES))
   $(call add_json_bool, OnlyPreoptBootImageAndSystemServer,      $(filter true,$(WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY)))
   $(call add_json_bool, UseArtImage,                             $(filter true,$(DEXPREOPT_USE_ART_IMAGE)))