Support DT_RUNPATH in the linker.

Only $ORIGIN substitution is supported, but not linux-specific $LIB
or $PLATFORM.

Change-Id: I5814a016c7c91afba080230a547a863686e7c2b9
diff --git a/tests/Android.build.mk b/tests/Android.build.mk
index 5b2b417..6d4faa9 100644
--- a/tests/Android.build.mk
+++ b/tests/Android.build.mk
@@ -48,6 +48,10 @@
     LOCAL_MULTILIB := $($(module)_multilib)
 endif
 
+ifneq ($($(module)_relative_path),)
+    LOCAL_MODULE_RELATIVE_PATH := $($(module)_relative_path)
+endif
+
 LOCAL_CFLAGS := \
     $(common_cflags) \
     $($(module)_cflags) \