[fastjar] Rename configure.in to configure.ac

[Kelley Cook]

I also broke this hunk out from the general patch since it is slightly 
different from the rest of the otherwise straightforward patch.

Since automake needed to be run anyhow (otherwise 
--enable-maintainer-mode would have been broken), I used automake 1.7.9 
which has the added benefit that all of current GCC 3.4 would be using 
either 1.7.9 or the special java 1.4 version.

The regenerated configure remained identical to before.

Bootstrapped i686-pc-cygwin (along with the other three patches, which 
are similar but separate).

OK for install?
Kelley Cook

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