Add support for LOCAL_JAVACFLAGS

The Dalvik core libraries team would like to start making warnings
errors in certain packages by definition LOCAL_JAVACFLAGS. This will
allow easier debuging of warnings in other packages by supplying
"-Xlint:..."  options.
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 92b5ff6..1977115 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -25,5 +25,6 @@
 
 include $(BUILD_SYSTEM)/base_rules.mk
 
+$(LOCAL_BUILT_MODULE): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS)
 $(LOCAL_BUILT_MODULE): $(java_sources) $(java_resource_sources) $(full_java_lib_deps)
 	$(transform-host-java-to-package)