Java: Fix gcjh JNI bug

[Bryce McKinlay]

"gcjh -jni" now looks at superclasses in order to determine if a given 
class is a throwable. Unfortunatly if it tried to do this for any class 
which did not directly extend throwable it would give an error like:

"couldn't find class `ava.lang.Object'."

Because it was calling itself with a classname extracted from the super 
field of a classfile while it expected the class name as a signature 
fragment (ie with a leading 'L'), and so was stripping the first 
character. In addition the super class name obtained directly from the 
classfile data is not null terminated, so we must copy it into a 
null-terminated string before recursing.

This patch fixes, ok to commit?

regards

Bryce.

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