Fix $(so_suffix) error.

Change-Id: I32cb4d4efe0a473e67a54c035df4dd82b6e4a3f0
diff --git a/core/prebuilt.mk b/core/prebuilt.mk
index f5732d1..fd8e0f5 100644
--- a/core/prebuilt.mk
+++ b/core/prebuilt.mk
@@ -89,7 +89,7 @@
 # since we use -rpath-link which points to the built module's path.
 built_shared_libraries := \
     $(addprefix $($(my_prefix)OUT_INTERMEDIATE_LIBRARIES)/, \
-    $(addsuffix $(so_suffix), \
+    $(addsuffix $($(my_prefix)SHLIB_SUFFIX), \
         $(LOCAL_SHARED_LIBRARIES)))
 $(LOCAL_BUILT_MODULE) : $(built_shared_libraries)
 endif