Add support for JNI shared objects into Java builds.

[emrainey]

include $(PRELUDE)
TARGET := MyJava
TARGETTYPE := jar
ENTRY := com.somepath.Class
JSOURCES = $(call all-java-under,com)
SHARED_LIBS := foo
include $(FINALE)

The "SHARED_LIBS" would be a list of JNI libraries that the jar requires to build/deploy with. These make the jars platform dependent (probably a bad idea) but would be required at least for dependency generation.