When an obfuscated text is used in an application with memory
pressure, the iteration over the obfuscated string can cause a
NullPointerException to be thrown from gnu.text.CharMap. The CharMap
uses weak references to Char objects to make Chars eq?. However, Kawa
does not check whether the Char returned from the WeakReference.get()
method is null and then attempts to take its intValue(). In
applications where there is little memory pressure the WeakReferences
are unlikely to be GCed so we don't normally observe this erroroneous
behavior.

This commit updates kawa-1.11-modified.jar with a check whether the
Char returned by the WeakReference is null prior to taking the
intValue(). If the Char is null, it will fall through to recreate the
Char and add it to the CharMap.

Change-Id: Idb19540b6096a9609a8aa06e77d628cd3ce1dc6b