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/java.mk b/core/java.mk
index ddb8737..65c4c8a 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -135,6 +135,7 @@
 # This intentionally depends on java_sources, not all_java_sources.
 # Deps for generated source files must be handled separately,
 # via deps on the target that generates the sources.
+$(full_classes_compiled_jar): PRIVATE_JAVACFLAGS := $(LOCAL_JAVACFLAGS)
 $(full_classes_compiled_jar): $(java_sources) $(full_java_lib_deps)
 	$(transform-java-to-classes.jar)