Add ld.config.txt for Android 8.x+ trees

- Fixes the ld.config.txt errors in recovery log which may prevent
  decryption and shell commands from working properly

Change-Id: I0e057525cdda39e8ac10115d37e2cb882b9c4844
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index d330799..4640d03 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -370,6 +370,7 @@
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libvintf.so
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libtinyxml2.so
     RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/android.hidl.token@1.0.so
+    RELINK_SOURCE_FILES += $(TARGET_OUT_ETC)/ld.config.txt
     ifneq ($(wildcard system/core/libkeyutils/Android.bp),)
         RELINK_SOURCE_FILES += $(TARGET_OUT_SHARED_LIBRARIES)/libkeyutils.so
     endif