Add build rules for libRSSupportIO (Usage_IO lib for RS compat lib)

bug 12924018

Change-Id: I35af72c1f7788f9fd9cb24bfabdbbad09e865a8b
diff --git a/core/java.mk b/core/java.mk
index 13cf39d..dd628b2 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -233,10 +233,16 @@
 rs_jni_lib := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/librsjni.so
 LOCAL_JNI_SHARED_LIBRARIES += libRSSupport librsjni
 
+rs_support_io_lib :=
+# check if the target api level support USAGE_IO
+ifeq ($(filter $(RSCOMPAT_NO_USAGEIO_API_LEVELS),$(renderscript_target_api)),)
+rs_support_io_lib := $(TARGET_OUT_INTERMEDIATE_LIBRARIES)/libRSSupportIO.so
+LOCAL_JNI_SHARED_LIBRARIES += libRSSupportIO
+endif
 
 
 $(rs_compatibility_jni_libs): $(RenderScript_file_stamp) $(RS_PREBUILT_CLCORE) \
-    $(rs_support_lib) $(rs_jni_lib) $(rs_compiler_rt)
+    $(rs_support_lib) $(rs_support_io_lib) $(rs_jni_lib) $(rs_compiler_rt)
 $(rs_compatibility_jni_libs): $(BCC_COMPAT)
 $(rs_compatibility_jni_libs): PRIVATE_CXX := $(TARGET_CXX)
 $(rs_compatibility_jni_libs): $(renderscript_intermediate)/librs.%.so: \