Fix prebuilt library dependency for multilib build

Also we don't need to include module_arch_supported.mk again, if we are
currently substituting the source build with LOCAL_PREBUILT_MODULE_FILE.

Change-Id: I444b0397d74c3153b398a050b762e49418062a86
diff --git a/core/executable_internal.mk b/core/executable_internal.mk
index 1edcd2c..a1ce7f2 100644
--- a/core/executable_internal.mk
+++ b/core/executable_internal.mk
@@ -17,7 +17,7 @@
 skip_build_from_source :=
 ifdef LOCAL_PREBUILT_MODULE_FILE
 ifeq (,$(call if-build-from-source,$(LOCAL_MODULE),$(LOCAL_PATH)))
-include $(BUILD_PREBUILT)
+include $(BUILD_SYSTEM)/prebuilt_internal.mk
 skip_build_from_source := true
 endif
 endif