Patch: update libgcj configury, try 2

[Mohan Embar]

Hi Tom,

>I wonder if we'll need some kind of automake patch to handle this.
>The thing is, automake does this in the name of portability across
>make implementations.  But we no longer care about that (if we ever
>did) -- we're free to assume GNU make.

If we can assume GNU make, we can use $(call).

-- Mohan
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