Needed symbols not available to Native code in Win95

When javai.dll/javai.lib are linked on Win95/NT the following symbols are not
available to native methods linked into an independent dll. They are defined
in interpreter.h and are available on Solaris when the .so is loaded dynamically.
They need to be available in Win95 and Mac ports as well.

 is_instance_of - to check access to fields
 newobject
 do_execute_java_method_vararg - needed to pass/return long/float types


These are used in code to serializate/deserializate objects to maintain object integrity.