Fix ld_library_path now that a target can be 64bits only.

Change-Id: I7cf3429bb460a784433429da19b201cb2947bc48
diff --git a/build/Android.gtest.mk b/build/Android.gtest.mk
index 56e95b8..1b4616f 100644
--- a/build/Android.gtest.mk
+++ b/build/Android.gtest.mk
@@ -372,7 +372,11 @@
         2nd_library_path := $$(ART_TEST_ANDROID_ROOT)/lib
         library_path := $$(ART_TEST_ANDROID_ROOT)/lib64
       else
-        library_path := $$(ART_TEST_ANDROID_ROOT)/lib
+        ifneq ($(filter %64,$(TARGET_ARCH)),)
+          library_path := $$(ART_TEST_ANDROID_ROOT)/lib64
+        else
+          library_path := $$(ART_TEST_ANDROID_ROOT)/lib
+        endif
       endif
     endif