No longer honor `DONT_INCLUDE_RUNTIME_APEX`.

The Android Runtime APEX is always included on all products.

Test: make systemimage on marlin-userdebug
Test: make systemimage on sailfish-userdebug
Bug: 113373927
Change-Id: I47b02ee44562b8da17bd960825a3489572018d93
diff --git a/target/product/runtime_libart.mk b/target/product/runtime_libart.mk
index 71834aa..f1b09c1 100644
--- a/target/product/runtime_libart.mk
+++ b/target/product/runtime_libart.mk
@@ -52,9 +52,7 @@
 # ART/dex helpers.
 PRODUCT_PACKAGES += art-tools
 # Android Runtime APEX module.
-ifneq ($(DONT_INCLUDE_RUNTIME_APEX), true)
-  PRODUCT_PACKAGES += com.android.runtime
-endif
+PRODUCT_PACKAGES += com.android.runtime
 
 # Certificates.
 PRODUCT_PACKAGES += \